Dissertations / Theses: 'Passive UHF RFID tags'

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Contractor, Bhavik. "Two Dimensional Localization of Passive UHF RFID Tags." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1229465514.

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Sajal, Sayeed Zebaul Haque. "Low-Cost Passive UHF RFID Tags on Paper Substrates." Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/27426.

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To reduce the significant cost in the widespread deployment of UHF radio frequency identification (RFID) systems, an UHF RFID tag design is presented on paper substrates. The design is based on meander-line miniaturization techniques and open complementary split ring resonator (OCSRR) elements that reduce required conducting materials by 30%. Another passive UHF RFID tag is designed to sense the moisture based on the antenna's polarization. An inexpensive paper substrate and copper layer are used for flexibility and low-cost. The key characteristic of this design is the sensitivity of the antenna's polarization on the passive RFID tag to the moisture content in the paper substrate. In simulations, the antenna is circularly-polarized when the substrate is dry (?r = 2.38) and is linearly-polarized when the substrate is wet (?r = 35.35). It was shown that the expected read-ranges and desired performance could be achieved reducing the over-all cost of the both designs.

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Gao, Jinlan. "Antenna-based passive UHF RFID sensor tags : Design and application." Doctoral thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-19889.

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RFID, as a low cost technology with a long life time, provides great potential for transmitting sensor data in combination with the ordinary ID number. The sensor can, for example, be integrated either in the chip or in the antenna of an RFID tag.This thesis focuses on the design of antenna-based UHF RFID sensor tags as wireless sensors at the lowest possible cost level compatible with standard communication systems in logistics. The applications of the sensor tags, in this work, mainly target remote humidity sensing. Antenna-based sensory UHF RFID tags utilize the influence that the physical or chemical parameters to be sensed have on the electrical properties of a tag antenna. The variations of the electrical properties of the tag antenna can be measured in many ways. In the thesis, a description is provided as to how these variations are normally measured by an RFID reader without any other assistant equipment. Three structures of antenna-based RFID sensor tags are presented with detailed characterizations. The first one utilizes the sensitivity of the antenna to the surrounding environment to construct RFID sensor tags, where a moisture absorbing layer providing wetness/humidity sensor functionality is placed on the RFID tag antenna to increase the humidity concentration surrounding the tag antenna and the thesis describes how to overcome certain limitations due to disturbances associated with background materials. The second structure directly integrates a small resistive sensor element into an RFID tag antenna and the sensor information can thus modulate the antenna performance by means of galvanic contact. The third structure embeds a small resistive sensor element into a loop which is positioned on top of the tag antenna and the sensor information can thus modulate the performance of the tag antenna by means of electromagnetic coupling. Both theoretical analysis and fullwave simulations are presented for the latter two sensor tag structures in order to characterize the performance of the sensor tags. An ultra-low cost printed humidity sensor with memory functionality is also designed and thoroughly characterized for integration into RFID tag antennas by means of galvanic contact or electromagnetic coupling. The sensor is a 1-bit write-once-read-many (WORM) memory printed using conductive ink. The WORM works as a pure resistive humidity sensor and can provide information about an historical event. The WORM sensor is presented by introducing its geometry, characterizingits behavior in humidity and explaining the principle of the humidity effect. The WORM sensors are also integrated into the RFID tags by means of both galvanic contact and electromagnetic coupling in order to experimentally verify the two concepts. To lower the cost of the RFID tags, the antennas are normally printed, milledor etched on flexible substrates using low-cost high-speed manufacturing methods which in some cases cause a high degree of edge roughness. The edge roughness will affect the behavior of the antenna, however, the characteristics of edge roughness on RFID antennas have previously not received any significant attention. Unforeseen antenna behavior can affect the antenna-based sensor tags, thus the influence of edge roughness is also investigated in the thesis.

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Wu, Xunxun. "Design of Passive UHF RFID Tag Antennas and Industry Application." Thesis, Högskolan i Gävle, Institutionen för teknik och byggd miljö, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8052.

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Nowadays, there is a growing demand for reliable assets security and management in various industries. The company SolarWave is eager to implement a comprehensive security system to produce active protection for their expensive product: solar panels. This security system is not only including assets tracking, monitoring but also combined with a control system, which is used to binary control a switch of solar panel to be on in presence of the correct ID and off in absence of the correct ID. One of the technologies that made this concept viable is known as Radio Frequency Identification (RFID). The thesis project is a sub-project in the development project whose content is mentioned as above. It contains two main parts. One is the system solution for the company. The other is RFID tag design which is in parallel with the company solution in order to reach a scientific level of a master thesis. In this thesis, I systematically analyze the operating mechanism and characteristics of RFID, and propose both active and passive RFID solutions for the company. And I also suggest an alternative radio technology ZigBee which can be used instead or as a complement to RFID. Meanwhile, I propose two designs of RFID tag according to the specification of the solar panel. One is modified meandering antenna. This kind of antenna is very effective and popular in RFID tag design in order to minimize the size of antenna. The other is inductively coupled loop antenna. It is a very useful method for conjugate matching in RFID tag antenna. The required input resistance and reactance can be achieved separately by choosing appropriate geometry parameters. It makes the antenna easier to match to the tag chips. Both the RFID antenna designs are simulated on Ansoft HFSS 12.

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Miranda, Hugo Manuel Oliveira de. "Sistemas RFID UHF." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/16273.

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Mestrado em Engenharia Eletrónica e Telecomunicações
O interesse por sistemas de identificação por radiofrequência (RFID) tem aumentado de forma significativa nos últimos anos, principalmente na identificação e tracking de objectos, animais e pessoas através de um modo de comunicação sem fios. Esta comunicação é feita por ondas de rádio que são transmitidas por um leitor, através de uma antena a um identificador (etiqueta) que atribui a um objeto uma identidade única, o chamado código de identificação único. Esta tecnologia não só identifica, mas também armazena dados atribuídos a determinado objeto, animal ou pessoa. No entanto, o RFID apresenta ainda consideráveis limitações, que inviabilizam o seu uso. Duas importantes razões que tornam esta tecnologia menos interessante _e o seu excessivo custo, causado não só pelos preços dos leitores e das antenas, mas também pelo preço do processo de fabrico das etiquetas; e devido ao facto de serem usados leitores não-reconfiguráveis a novos protocolos de comunicação, novas etiquetas ou até mesmo alterações de frequências. O primeiro objetivo deste projeto foi então desenvolver um front end de radiofrequência para a construção de um leitor RFID UHF reconfigurável de baixo custo, baseado em circuitos programáveis DSP ou FPGA, com um processador embutido e software-defined radio. Com isto pretende-se que os leitores RFID não dependam de transceivers RFID comerciais. Além disso, com este estudo pretendeu-se também a desenvolver antenas e etiquetas RFID, em material orgânico flexível, com um processo de produção de etiquetas simples e de baixo custo. Na primeira parte deste projeto, foi proposto um front end para a banda RFID UHF Europeia e para a banda Americana, que poderá ser usado, no futuro, no desenvolvimento de um leitor RFID. Este front end foi desenhado para ser robusto, de baixo custo, e com o objetivo de emitir e receber sinais de rádio. Na segunda parte, foram desenvolvidas duas antenas para leitores, uma para a banda RFID UHF Americana e outra para a banda RFID UHF Europeia. Por _ultimo, foi alterada uma impressora convencional, comercialmente disponível, e foram feitas também alterações na tinta de impressão, tornando-a condutora, para impressão de antenas para etiquetas RFID em substratos _a base de papel. Todos os parâmetros fundamentais das antenas foram simulados numericamente e testados experimentalmente. As duas antenas testadas mostraram boas performances, em particular, a antena para a banda RFID UHF Europeia, cujos valores resultantes dos testes experimentais foram muitos similares aos encontrados computacionalmente, sendo mesmo melhores para alguns parâmetros. Esta antena, não só apresentou uma boa performance na banda mencionada, mas também na banda RFID UHF Americana. Foram desenvolvidas sete etiquetas RFID, ou seja, desenhadas e impressas usando a impressora jato de tinta modificada, e testadas posteriormente. Todas as etiquetas funcionaram, embora uma delas não tenha apresentado resultados tão satisfatórios. Podemos então concluir que a nossa tecnologia permitiu ter etiquetas impressas por uma impressora convencional e, desta forma, poderá oferecer uma maior independência ás empresas que as produzem, podendo mesmo ser utilizada em ambientes de I&D, em Universidades ou Escolas, de modo simples e barato.
In recent years, Radio Frequency IDentification (RFID) technology has received special attention, especially for identifying and tracking objects, animals and people through a wireless communication connection. Radio waves transmitted from a reader, through an antenna to an identifier, called tag, which attributes an Unique Identification Number (UID) to a object, animal or person are used for this communication. This technology not only helps to identify, but also to collect data attributes about a certain person or object. However, RFID still has important limitations, which slows down its growth considerably. The two main reasons for that are related not only with the excessive cost of this system due to the readers and antennas, but also because it uses non-reconfigurable readers to new communication protocols, tags or even changes in frequencies. Therefore, the first purpose of this project was to develop a front-end to be included into a low-cost reconfigurable RFID UHF reader, based on FPGA or DSP, with an embedded processor and a software-defined radio. In a long-term, it is intended to have readers that does not require commercial RFID transceivers. The second purpose of this study was to develop a simple and low-cost manufacturing process of antennas and tags in exible and organic material. Firstly, a front end for RFID UHF bandwidth across the European Union and in the North America was proposed to be implemented in the future. This front end was designed to be low-cost, robust, in order to emit and receive radio signals. Secondly, two antennas, respectively, for an American and European UHF bandwidth RFID reader were developed in this project. Ultimately, an ordinary home inkjet-printer was modified to jet conductive ink, created as a part of this study, to print tag antennas in paper based substrate. All of the fundamental parameters that needed to be evaluated for antennas were experimentally simulated and tested for the two antennas. Both showed high performances, particularly, the antenna for a European UHF bandwidth RFID reader. This antenna obtained results more similar to the numerical model, and experimental findings were even better for some parameters. Its performance was found to be high even for an American UHF bandwidth RFID reader. Furthermore, seven RFID tags were developed, meaning they were designed and printed on the modified home inkjet-printer, and then its performance was tested. Although one of these tags showed not to be highly efficient, all tags worked adequately for the purpose. Therefore, we can conclude that our technology allowed to print RFID tags using a modified home inkjet-printer, indicating that this method can offer more independency to RFID tag manufacturers and, also allow an extensive use of this system in I&D environment, University or Schools, since it is simple and cheap.

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Cremer, Markus. "Digital beamforming techniques for passive UHF RFID tag localization." Thesis, London South Bank University, 2016. http://researchopen.lsbu.ac.uk/1819/.

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Radio-frequency identification (RFID) technology is on the way to substitute traditional bar codes in many fields of application. Especially the availability of passive ultra-high frequency (UHF) RFID transponders (or tags) in the frequency band between 860 MHz and 960 MHz has fostered the global application in supply chain management. However, the full potential of these systems will only be exploited if the identification of objects is complemented by accurate and robust localization. Passive UHF RFID tags are cost-effective, very small, extremely lightweight, maintenancefree, rugged and can be produced as adhesive labels that can be attached to almost any object. Worldwide standards and frequency regulations have been established and a wide infrastructure of identification systems is operated today. However, the passive nature of the technology requires a simple communication protocol which results in two major limitations with respect to its use for localization purposes: the small signal bandwidth and the small allocated frequency bandwidth. In the presence of multipath reflections, these limitations reduce the achievable localization accuracy and reliability. Thus, new methods have to be found to realize passive UHF RFID localization systems which provide sufficient performance in typical multipath situations. In this thesis, an enhanced transmission channel model for passive UHF RFID localization systems has been proposed which allows an accurate estimation of the channel behaviour to multipath. It has been used to design a novel simulation environment and to identify three solutions to minimize multipath interference: a) by varying the channel interface parameters, b) by applying diversity techniques, c) by installation of UHF absorbers. Based on the enhanced channel model, a new method for tag readability prediction with high reliability has been introduced. Furthermore, a novel way to rate the magnitude of multipath interference has been proposed. A digital receiver beamforming localization method has been presented which uses the Root MUSIC algorithm for angulation of a target tag and multipath reducing techniques for an optimum localization performance. A new multiangulation algorithm has been proposed to enable the application of diversity techniques. A novel transmitter beamforming localization approach has been presented which exploits the precisely defined response threshold of passive tags in order to achieve high robustness against multipath. The basic technique has been improved significantly with respect to angular accuracy and processing times. Novel experimental testbeds for receiver and transmitter beamforming have been designed, built and used for verification of the localization performance in real-world measurements. All the improvements achieved contribute to an enhancement of the accuracy and especially the robustness of passive UHF RFID localization systems in multipath environments which is the main focus of this research.

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Atojoko, Achimugu A. "Design and Modelling of Passive UHF RFID Tags for Energy Efficient Liquid Level Detection Applications. A study of various techniques in the design, modelling, optimisation and deployment of RFID reader and passive UHF RFID tags to achieve effective performance for liquid sensing applications." Thesis, University of Bradford, 2016. http://hdl.handle.net/10454/15906.

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Sewer and oil pipeline spillage issues have become major causes of pollution in urban and rural areas usually caused by blockages in the water storage and drainage system, and oil spillage of underground oil pipelines. An effective way of avoiding this problem will be by deploying some mechanism to monitor these installations at each point in time and reporting unusual liquid activity to the relevant authorities for prompt action to avoid a flooding or spillage occurrence. This research work presents a low cost energy efficient liquid level monitoring technique using Radio Frequency Identification Technology. Passive UHF RFID tags have been designed, modelled and optimized. A simple rectangular tag, the P-shaped tag and S-shaped tag with UHF band frequency of operation (850-950 MHz) has been designed and modelled. Detailed parametric analysis of the rectangular tag is made and the optimised design results analysed and presented in HFSS and Matlab. The optimised rectangular tag designs are then deployed as level sensors in a gully pot. Identical tags were deployed to detect 4 distinct levels in alternate positions and a few inches in seperation distance within the gully pot height (Low, Mid, High and Ultra high). The radiation characteristic of tag sensors in deployment as modelled on HFSS is observed to show consistent performance with application requirements. An in-manhole chamber antenna for an underground communication system is analysed, designed, deployed and measured. The antenna covers dual-band impedance bandwidths (i.e. 824 to 960 MHz, and 1710 to 2170 MHz). The results show that the antenna prototype exhibits sufficient impedance bandwidth, suitable radiation characteristics, and adequate gains for the required underground wireless sensor applications. Finally, a Linearly Shifted Quadrifilar Helical Antenna (LSQHA) designed using Genetic Algorithm optimisation technique for adoption as an RFID reader antenna is proposed and investigated. The new antenna confirms coverage of the RFID bandwidth 860-960 MHz with acceptable power gain of 13.1 dBi.

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Taoufik, Sanae. "Fiabilité et analyse de défaillance des tags RFID UHF passifs sous contraintes environnementales sévères." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR009/document.

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Ces dernières années, la technologie RFID (identification par radiofréquence) s’est fortement développée dans de nombreuses applications industrielles parmi lesquelles les secteurs de l’aéronautique et l’automobile où il y a une forte demande en systèmes d’auto-identification fonctionnant dans des environnements difficiles. Dans ce contexte, l'objectif de ces travaux de thèse est d'étudier les effets du stockage thermique sur la fiabilité des tags RFID UHF passifs. Pour ce faire nous avons adopté une méthodologie homogène contribuant de façon significative à atteindre nos objectifs. La première étape de cette méthodologie consistait à choisir le tag à tester, deux types de tags Web et Tageos provenant de deux fabricants différents ont été soumis à des tests de vieillissement accélérés sous différentes températures. La deuxième étape était de définir les paramètres des tests de vieillissement et de caractériser les tags vieillis. À l'aide d'un banc de mesure dédié, la puissance réfléchie par l’ensemble des tags vieillis est mesurée après chaque phase de vieillissement en fonction de la distance entre l’antenne du tag et celle du lecteur RFID. La puissance réfléchie diminue considérablement après chaque phase de vieillissement avec différentes dynamiques de dégradation pour tous les tags vieillis. Cette dynamique de dégradation dépend du type de tag testé et de la température de test. La dernière étape de la méthodologie comportait l’analyse statistique et physique de défaillance, des différences claires dans les modes, les mécanismes et les temps de défaillance entre les tags Web et Tageos ont été observées. L’analyse physique de défaillance par microscopie optique et MEB a révélé des fissures dans les conducteurs métalliques de l'antenne pour une partie des tags vieillis, cependant pour l’autre partie des tags, aucune défaillance de l'antenne n'a été observée. Des déformations au niveau de la matrice polymère de l'ACP ont été révélées, ce qui a modifié l'adaptation d'impédance entre le RFIC et l'antenne. Des simulations en utilisant le logiciel de modélisation multi-physique COMSOL a été mise en place dans le but de reproduire les mécanismes de défaillances révélés expérimentalement soit au niveau de l’antenne ou de la RFIC. Ces travaux de thèse ont démontré l'importance d'étudier les effets du stockage en haute température sur la fiabilité des tags RFID passifs. Les défaillances sont apparues plus rapidement et les tests ont coûté considérablement moins onéreux par rapport aux autres types de tests de vieillissement accélérés
Nowadays, RFID has strongly developed in many industrial applications, including the aeronautics and automotive sectors, where there is a strong demand for auto-identification systems operating in severe environments. In this context, the objective of this thesis is to study the effects of thermal storage on the reliability of passive UHF RFID tags. To achieve this, we adopted a consistent methodology. The first step of this methodology was to choose the tag under test. Two types of tags Web and Tageos from two different manufacturers are aged under high temperatures. The second step was to define the parameters of the aging tests and to characterize the aged tags. Using a dedicated measurement bench, the reflected power is measured after each aging phase for all tested tags to determine the power loss caused by the high temperature storage. Reflected power decrease significantly after each aging phase with different dynamics of degradation for all aged tags. This dynamics of degradation depends on the temperature test and the type of tag. The final step involved statistical and physical failure analysis. Clear differences about modes, mechanisms and failure times between Web and Tageos tags have been observed, it seems that Tageos tags are more reliable than Web tags. Failure analysis of the samples, using an optical microscope and SEM, has revealed, cracks in the antenna metallic conductors on a part of the aged tags. In another part of the tags, no failures in the antenna have been seen, but clear deformations at the polymer matrix of the ACP have been observed, thus changing the impedance matching between the RFIC and the antenna. Simulations using the COMSOL multiphysics software have been implemented in order to reproduce the experimental failure mechanisms. This thesis work has demonstrated the importance of studying the effects of high temperature storage on the reliability of passive RFID tags. Failures appeared faster and tests cost considerably less than other types of accelerated aging tests

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Proffitt, Donnie E. II. "EXPERIMENTAL INVESTIGATION TO INFORM OPTIMAL CONFIGURATIONS FOR DYNAMIC NEAR-FIELD PASSIVE UHF RFID SYSTEMS." UKnowledge, 2013. http://uknowledge.uky.edu/me_etds/29.

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RFID has been characterized as a “disruptive technology” that has the potential to revolutionize numerous key sectors. A key advantage of passive RFID applications is the ability to wirelessly transmit automatic identification and related information using very little power. This paper presents an experimental investigation to inform the optimal configuration for programming passive ultra-high frequency (UHF) RFID media in dynamic applications. Dynamic programming solutions must be designed around the tag’s functionality, the physical programming configuration and environment. In this investigation, we present a methodology to determine an optimal configuration to maximize the systems programming efficiency for dynamic applications.

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Andia, Vera Gianfranco. "Analyse et exploitation des non linéarités dans les systèmes RFID UHF passifs." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT052/document.

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Avec l'explosion de l'Internet des Objets (IoT), de nouveaux dispositifs permettant de tagguer les objets sont nécessaires afin de permettre non seulement leur identification mais aussi d'assurer des communications fiables et de nouvelles fonctionnalités comme la détection, la localisation ou la capture d'informations. Cette tendance s'appuie sur la technologie bien établie qu'est la radiofréquence par identification (RFID) et donc l'utilisation d'étiquettes (ou tags) faibles coûts et télé-alimentés. Dans ce contexte, de nombreux travaux au niveau de la couche d'application se tournent vers la mise au point de traitements logiciels complémentaires visant à produire de nouveaux types d'information. D'autres travaux visent à améliorer la couche physique avec l'objectif de miniaturiser encore le tag mais aussi de le doter de nouvelles capacités. Jusqu'à présent, il n'existe quasiment pas de travaux concernant la transmission du signal et aucun sur l'exploitation du comportement non-linéaire des puces RFID. Cette thèse vise à étudier les phénomènes non-linéaires produits lors d'une communication RFID.Dans la première partie, deux plateformes de mesure et de caractérisation spécifiques ont été développées : la première vise à observer les signaux au cours d'une communication RFID, et alors caractériser et analyser les effets liés aux phénomènes non linéaires ; la seconde permet d'effectuer différentes mesures directement sur les puces et les caractériser en termes d'impédance, production d'harmoniques et sensibilité. Ces plateformes ont permis : 1) de mettre en évidence que les fréquences harmoniques sont porteuses d'informations qui peuvent être exploitées et même offrir de nouvelles fonctionnalités ; 2) d'obtenir de nombreuses informations sur les propriétés des puces et d'en établir un modèle électrique précis ; 3) de déterminer des critères permettant d'évaluer la performance des tags dans le contexte étudié.Dans la deuxième partie, plusieurs nouveaux tags RFID ont été conçus, fabriqués, mesurés et évalués. Ces nouveaux tags fonctionnent non seulement dans la bande UHF mais aussi sont adaptés à la troisième harmonique dans la bande des microondes. Une méthodologie et des lignes directives d'aide à la conception de ce type de tags ont été établies et s'appuient sur les deux plateformes développées afin de caractériser les différents éléments. Dans un même temps, les effets liés à la fabrication ont aussi été étudiés et des études paramétriques ont permis de mettre en évidence l'effet sur les performances de la géométrie de l'antenne et du type de puce utilisée.Dans une troisième partie, les études se sont focalisées à exploiter les effets non-linéaires des dispositifs de redressement. L'idée générale est de coupler la RFID passive avec les dispositifs de transferts de puissance et de récupération d'énergie avec pour objectifs 1) de maximiser l'efficacité de conversion RF – continu 2) et d'augmenter la distance de lecture des tags passifs. Plusieurs prototypes ont été réalisés et leurs performances ont été démontrées.L'ensemble de ces travaux a mis en évidence un nouveau concept de communication RFID exploitant les non-linéarités générées par les puces RFID. Ce concept ouvre la voie à de nouvelles applications. et a fait l'objet d'une demande de brevet international
Powered by the exploding popularity of the Internet-of-Things (IoT), the demand for tagged devices with labels capable to ensure a reliable communication with added functions beyond the identification, such as sensing, location, health-care, among others, is growing rapidly. Certainly this growing is headed by the well-established Radio Frequency Identification (RFID) technology, and the use of wireless low-cost self-powered tags, in other words passive RFID tags, is the most widespread used alternative. In the constant evolution on this field, usually new software treatments are offered at the application layer with the objective to processing data to produce some new information. Further works aimed at improving the physical layer around the tag antenna miniaturization and matching techniques. So far, little or no work had been done on the exploitation of the communication channel, and certainly none has been done on the exploitation of the non-linear behavior of RFID chips.After presenting the RFID technology and phenomena produced by Radio Frequency (RF) non-linear devices, and leaning in some nearby works on the field, the core of this thesis starts by exposing two characterization platforms for the evaluation of non-linear phenomena presented during the reader-tag communication. One is specialized in radiating measurements considering the whole tag (antenna and chip) under test. The other is specialized in conducted measurements directly over RFID chips, allowing performing different parametric studies (power dependency, impedance, harmonic production, sensitivity). The characterization results show that harmonic signals generated from the passive RFID chip carry information.By exploiting the characterization results and to verify the hypothesis of exploitation of non-linearities in RFID, i.e. the use of harmonic signals, the research is pursued by designing, fabricating, and measuring four different configurations of RFID tags. The new RFID tags operate at the fundamental frequency in the UHF band and at its $3^{rd}$ harmonic in the microwave band. Antenna design policies, fabrication details, and parametric studies on the performance of the new prototypes are presented. The parametric study takes special care in the antenna structure, kind of chip used, received power, and read range.Finally, some alternatives approaches for the exploitation of non-linear effects generated by rectifying devices are presented. Some theoretical aspects and experimental results are discussed linking the passive RFID technology to the theories of Wireless Power Transfer (WPT) and Electromagnetic Energy Harvesting (EEH). The solution takes advantage of the non-linear nature of rectifying elements in order to maximize the RF-to-DC conversion efficiency of EEH devices and increase the read range of passive RFID tags. The solution triggers on the design of a RF multi-device system. The design procedure and tests consider three non-linear phenomena: (1) the impedance power dependency, (2) the harmonic production, and (3) the rectifying dependence on the RF waveform

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Shao, Shuai. "Design and Optimization of Passive UHF RFID Tag Antenna for Mounting on or inside Material Layers." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1435758466.

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Bhattacharyya, Rahul. "Low-Cost, Passive UHF RFID Tag Antenna-Based Sensors for Pervasive Sensing Applications." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/73791.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 161-170).
In the future, large-scale sensor deployment would enable many areas such as infrastructure condition monitoring and supply chain management. However, many of today's wireless sensor technologies are still too expensive to meet this need. Radio Frequency IDentification (RFID) offers good potential for the development of pervasive sensors: RFID tags have a proven track record of large-scale, highly integrated deployment for object identification in the retail and consumer goods industry. Furthermore, the last decade has seen much progress in making RFID a reliable, standardized wireless communication medium with the ability to mass produce low-cost RFID tags. My thesis introduces the concept of RFID Tag Antenna-Based Sensing (RFID TABS). In this approach, a change in the sensed parameter of interest induces a controlled change in the geometry or boundary conditions of an RFID tag's antenna. The resultant change in the tag's response signal can then be detected by an RFID reader. My approach builds upon current developments in RFID technology. For instance, the manufacturing techniques for the mass production of low-cost RFID tags can be used for pervasive tag-sensor development. My thesis examines TABS in a two-pronged approach: First, I demonstrate how three fundamental tag and reader signal properties can be used for sensing and propose three classes of TABS: -- Amplitude Modifying (AM) TABS use RFID reader transmitted power and tag response power for sensing. I illustrate proof of concept using a displacement sensor. I demonstrate that both these power metrics can be used to reliably measure structural displacement to a precision of 2.5 mm using commercial RFID tags. -- Frequency Modifying (FM) TABS relate changes in the sensed parameter to a shift in the tag's optimal operating frequency - the carrier frequency for which the tag is best tuned to respond to the reader. I demonstrate proof of concept using a temperature threshold sensor - the crossing of a design temperature threshold results in a shift in the sensor's optimal operating frequency. I demonstrate that the sensor works reliably over a 3 m read range and in different environmental conditions. -- Phase Modifying (PM) TABS use tag backscatter phase for sensing. I provide a brief summary of the factors influencing RF phase and outline the design for a PM TABS fluid level sensor that uses RFID tag response phase to detect the presence or absence of fluid in a beverage glass. I highlight the challenges in the practical implementation of this approach by demonstrating the sensitivity of RFID tag phase to three extraneous factors. Second, I introduce the concept of Non-Electric Memory to record short timescale threshold crossovers in the sensed parameter that may occur when the tag-sensor is unpowered. When information about, rather than the exact time of, the threshold occurrence is sufficient, non-electric memory provides a solution. I demonstrate how non-electric memory can be integrated into sensor design at minimal added cost. In the proof of concept of a temperature threshold sensor, I design a thermally actuated shape memory polymer switch to permanently change the electrical properties of an RFID tag when the temperature threshold is crossed. I demonstrate that the design works reliably over a read range of 3 m and is independent of the material on which the sensor is deployed. In summary, this thesis demonstrates how an RFID tag can be adapted for low cost, pervasive sensing. Sensor prototypes illustrate proof of concept in three application areas. Extensions to two other applications are also discussed.
by Rahul Bhattacharyya.
Ph.D.

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Gao, Bo. "Passive UHF RFID tag using electromagnetic band gap (EBG) material for metallic objects tracking /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?MECH%202007%20GAO.

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Dong, Haobo (Haobo Jack). "Passive EPC Class 1 Gen 2 UHF RFID sensor tag For health monitoring applications." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66026.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 101-102).
Parkinson's disease (PD) is a chronic and degenerative condition that affects millions of Americans. Current approach of PD evaluation, diagnosis, and treatment is mainly qualitative using the Unified Parkinson's Disease Rating Scale (UPDRS) or the Hoehn and Yahr scale. Assessment of the efficacy of the drugs used is difficult and subjective. A long-term monitoring device that can collect movement data in assisting quantitative analysis proves to be useful and needed. This thesis discusses a discrete prototype of a passive EPC Class 1 Gen 2 UHF RFID sensor tag which is a preliminary step in realizing such a monitoring device. The prototype is capable of collecting 8-bit sensor (temperature, inertial, etc) data and transmits it in real-time through a RFID backscatter link to an UHF reader. It is shown that the device can achieve a read distance up to 3 meters at 5 reads/s and a max data rate of about 640 Kbps.
by Haobo (Jack) Dong.
S.M.

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Nguyen, Dat Son. "Développement des capteurs sans fil basés sur les tags RFID uhf passifs pour la détection de la qualité des aliments." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00951402.

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Le but de cette thèse est de développer des capteurs sur la base des tags RFID, des technologies et matériaux disponibles au Vietnam afin de contribuer à résoudre la problématique du contrôle de la qualité des produits alimentaires. En effet la technologie RFID s'est affirmée en importance pour ses applications dans de nombreux domaines. Dans ce contexte, l'identification des produits alimentaires expirés, sans les endommager, est une orientation de recherche très prometteuse. Un tag RFID UHF passif peut aussi être composé de plusieurs puces et plusieurs antennes, chaque couple puce/antenne conçu pour travailler sur un intervalle déterminé de valeur de permittivité. Donc, à partir de l'ensemble des permittivités définies pour chaque couple puce/antenne et les signaux réfléchis vers le lecteur, nous pourrons "mesurer" la permittivité de l'objet tracé. Ainsi la connaissance de la permittivité des aliments et la conception spécifique de l'antenne, nous développerons un tag capteur de type "multi puce/antenne" qui sera utilisé comme un capteur sans fil pour la détection de la qualité des aliments

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Modaresi, Mahyar. "System and Method for Passive Radiative RFID Tag Positioning in Realtime for both Elevation and Azimuth Directions." Thesis, KTH, Communication Systems, CoS, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24562.

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In this thesis, design and realization of a system which enables precise positioning of RFID tags in both azimuth and elevation angles is explained. The positioning is based on measuring the phase difference between four Yagi antennas placed in two arrays. One array is placed in the azimuth plane and the other array is perpendicular to the first array in the elevation plane. The phase difference of the signals received from the antennas in the azimuth array is used to find the position of RFID tag in the horizontal direction. For the position in the vertical direction, the phase difference of the signals received from the antennas in the elevation plane is used. After that the position of tag in horizontal and vertical directions is used to control the mouse cursor in the horizontal and vertical directions on the computer screen. In this way by attaching one RFID tag to a plastic rod, a wireless pen is implemented which enables drawing in the air by using a program like Paint in Windows. Simulated results show that the resolution of the tag positioning in the system is in the order of 3mm in a distance equal to 0.5 meter in front of the array with few number of averaging over the received phase data. Using the system in practice reveals that it is easily possible to write and draw with this RFID pen. In addition it is argued how the system is totally immune to any counterfeit attempt for faked drawings by randomly changing the transmitting antenna in the array. This will make the system a novel option for human identity verification.

QC 20100920

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Pour, Sohrab Abed. "UHF RFID tags mountable on metallic and challenging objects." Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3021372/.

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Radio frequency identification (RFID) technology has been developing rapidly during the past years. It has been replacing optical barcodes and has found many applications beyond tagging and tracking objects. Despite their undeniable advantages, passive RFID tags working in the ultra-high frequency (UHF) band are sensitive to the host material and their performance is affected when attached to different materials. Although there are robust tag designs, the fabrication is costly. The motivation of this research is to study the effect of the challenging materials on the tags and find solutions for robust cost-effective designs. Liquid bottles are one of the challenging objects for RFID tags. The study on the equivalent circuit of a typical tag which is basically a dipole antenna shows the liquid increases the loss resistance of the antenna and affects the impedance matching between the antenna and the chip. Two extra arms are added to the antenna in the suggested solution to alleviate the destructive effect of the liquid. The read range of the tag is improved without increasing the size of the design. Study of the detuning effect shows that the capacitances in the antenna are the most sensitive elements. The presented theoretical analysis reveals that less capacitance in the feed point and more capacitance in the dipole arms lead to more robustness of the tag performance to the host material. Based on this finding a low cost 3D tag is designed. The label-type dipole tags offer desirable uniform radiation pattern but are not functional on metallic objects. On the other hand the patch antennas are not efficient on non-metallic objects in terms of read range and radiation pattern. A novel hybrid tag is proposed which has the advantage of both types of antenna. The simple groundless design works in two modes. It acts as a dipole antenna in off-metal mode and a patch antenna in on-metal mode. The measurement result shows an outstanding performance on different materials. Protecting the antenna from metallic background using an artificial ground plane composed of periodic structures is a practiced method. Mushroom unit cell is the most common structure used as artificial ground but the need for via increases the fabrication cost. It is shown that the fabrication cost can be reduced by eliminating the via and having a uni-planar structure. There has been many works in the literature proposing tag designs robust to the host material but what makes this works distinct from the previous works is in depth study on the effect of the challenging material on the performance of the tag antenna and identifying the main reason of the read range degradation for the first time. The findings of this study can be used for designing cost effective tags with improved read range. Analysis of the different parts of the tag antenna and their sensitivity to the host material is also performed for the first time in this thesis. The result of this study shows how the shape of the tag can determine the robustness to the host material. In addition to novel tag designs proposed in this thesis, a straightforward strategy for designing optimum tags is also introduced. This novel method helps the tag designers to modify the primary design step by step and reach the optimum result in a short time.

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Abdelmalek, Omar. "Conception et prototypage d'architectures robustes de tags RFID UHF." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT088/document.

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Les systèmes RFID sont de plus en plus utilisés dans des applications critiques fonctionnant dans des environnements perturbés (ferroviaire, aéronautique, chaînes de production ou agroalimentaire) ou dans des applications où la sécurité est essentielle (identification, lutte contre la contrefaçon). Pourtant, ces systèmes faibles coûts, initialement conçus pour des applications de masse non critiques, sont peu robustes par nature. Pour les applications critiques, les défaillances des puces RFID peuvent avoir des conséquences catastrophiques ou créer des failles de sécurité importantes. Ces défaillances peuvent avoir des origines nombreuses : par exemple, des origines matérielles dues au vieillissement naturel des circuits intégrés ou à des attaques (optiques, électromagnétiques, en tension). Il est donc d'usage dans les applications critiques d'accroître la robustesse des systèmes RFID par la mise en œuvre de redondance matérielle. Cependant cette redondance accroît le coût du déploiement des systèmes RFID ainsi que la complexité des protocoles et middleware associés. L'amélioration de la robustesse des tags permet de grandement limiter cette redondance. L'objectif de la thèse est d'accroitre la robustesse des tags UHF passifs en proposant et validant de nouvelles architectures numériques de puces RFID robustes à la fois aux défaillances et aux attaques matérielles. Les approches de durcissement des circuits intégrés étudient généralement leur robustesse par simulation et ce de manière indépendante à la validation de leur conception. La méthode la plus courante afin de valider la robustesse d'un circuit repose sur l'injection de fautes par simulation. Pour les puces RFID, ce type d'approche par simulation est problématique car les performances des puces dépendent de nombreux paramètres difficilement modélisables globalement. En effet, le fonctionnement d'un tag dépend de son environnement électromagnétique, du nombre de tags présents dans le système, des protocoles mis en œuvre. Aussi, nous avons développé une méthodologie basée sur le prototypage permettant d'éviter des simulations complexes et chronophages. La puce RFID prototype est alors implantée dans un FPGA. Ainsi, dès la phase de conception, cette puce peut être validée fonctionnellement dans un environnement réel. De plus, en utilisant différentes techniques d'instrumentation permettant l'injection de fautes dans les circuits numériques sur FPGA, il est alors possible d'analyser l'effet sur l'ensemble du système des fautes injectées dans le tag. Dans cette thèse, dans un premier temps, le prototype fonctionnel d'un tag RFID a été développé. Dans un second temps, ce prototype a été instrumenté pour pouvoir réaliser des injections de fautes en ligne ou hors ligne. Ensuite, le comportement du système RFID en présence de fautes dans ce tag RFID a été évalué. L'analyse des effets de ces fautes sur le système a permis de proposer, de mettre en œuvre et de valider de nouvelles architectures numériques de tags RFID robustes. Ce nouvel environnement de prototypage et d'injection de fautes a également permis de démontrer les effets de nouvelles attaques contre les systèmes RFID reposant sur l'insertion de tags fautifs ou malveillants dans les systèmes. Enfin, cette approche a permis d'évaluer les méthodes de détection des tags fautifs
RFID tags are more and more used for critical applications within harsh environments (aeronautics, railways) or for secure applications such as identification, countermeasure against counterfeiting. However, such low cost systems, initially designed for non-critical applications with a high volume, are not robust by themselves. For critical applications, a malfunction of RFID chip may have serious consequences or induce a severe security breach for hackers. Dysfunctions can have many origins: for instance, hardware issues can be due to aging effects or can also be due to hackers attack such as optical or electromagnetic fault injection. It is thus a common practice for critical applications to increase the robustness of RFID system. The main purpose of this PhD Thesis is to increase UHF tags robustness by proposing new digital architectures of RFID chips which would be resilient against both hardware attacks and natural defects.Usual design techniques for robustness IC improvement consist in evaluating the design robustness by simulation and to do this independently of the design validation. The main technique for robustness evaluation is the simulation based faults injection. Within the RFID context such an approach only based on simulation has several drawbacks. In fact, simulations often are inaccurate because the system behavior relies on several parameters such as the global electromagnetic environment, the number of tags present in the reader field, the RFID protocol parameters.The purposes of this PhD are to develop a design method dedicated to RFID system based on hardware prototyping in order to avoid time consuming simulations and then to evaluate the design within a real environment.The hardware prototyping based on FPGA allows the design to be validated in a real environment. Moreover, using instrumentation techniques for fault injection within FPGA , it will be then possible to analyze the effects of faulty tags on the global system in terms of safety and security and then to propose countermeasures.In this thesis an FPGA based emulation platform called RFIM has been developed. This platform is compliant to EPC C1 Gen2 RFID standard. The RFID tag emulator has been validated functionally in a real environment. The RFIM platform uses the instrumentation technique for injecting faults in the digital tag circuit. Through fault injection campaigns RFIM platform can analyze the effect on the entire system of the faults injected into the tag, and ten validate new robust digital architectures.The RFIM platform has been used to demonstrate the effects of further attacks against RFID systems based on the insertion of faulty or malicious tag that contains a hardware Trojan. Finally, RFIM platform helps to develop countermeasures against the fault effects. These countermeasures have been implemented and tested in a real RFID environment with several tags and reader

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Quiroz, Moreno Rafael Antonio. "Solutions novatrices pour l'amélioration du taux de lecture de tags RFID UHF dans des environnements complexes." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1037/document.

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L'identification par radio fréquence (RFID) est une technologie utilisant les ondes radio pour détecter, localiser et identifier des objets sur lesquels on place des étiquettes électroniques ou tags. Cette technologie, avec des fonctionnalités de détection supérieures à 2m, est destinée à remplacer le code-barre existant depuis les années 1970. Durant la dernière décennie, le développement de la RFID UHF a permis d'élargir le domaine des applications qui compte entre autres le marquage d'objets, le contrôle d'accès, la traçabilité, la logistique, l'inventaire, et même les transactions financières. Avec cette augmentation de la demande de services d'identification, les prévisions pour le marché de la RFID (actuellement dans les 12MM d'euros) montrent une augmentation de 3MM d'euros par an dans les 10 prochaines années. Actuellement la RFID UHF présente plusieurs limitations technologiques fortes expliquant que son développement est moins rapide que ce qui avait été envisagé il y a une vingtaine d'années. Deux problématiques industrielles importantes sont abordées dans ce travail. Tout d'abord la variété des supports sur lesquels les étiquettes RFID sont placées, cette variabilité des supports entraînant un déréglage des antennes des tags à cause du changement de la permittivité électrique et/ou de la conductivité du milieu. Dans ce contexte des solutions sont proposées au niveau de tags UHF pour une application sur surfaces en plastique ou en métal. La deuxième problématique est liée au couplage entre antennes lorsque la densité de tags est forte ou aux perturbations de diagramme (masquage) dues à l'environnement proche des antennes. Afin d'améliorer le taux de lecture dans ces conditions, une antenne lecteur miniaturisée à quatre IFAs intégrant de la diversité d'espace, de polarisation et de diagramme a été développée et testée dans un scénario à forte densité de tags
Radio Frequency Identification (RFID) is a technology designed to use the electromagnetic waves backscattering to establish detection and identification for different types of articles. Due to its longer coverage range, this technology seeks to replace the bars code existing since 1970. Recently RFID developments allow the growth in the number of applications including access control, tracking and logistic, inventory, and even electronic contactless payment between others. With this growing in the RFID services demand, the market value previsions (currently in 12MM euros) show an increase of 3MM euros per year during the next 10 years. Nowadays the RFID has many technical limitations that could explain the fact of the slow growth different of the initial estimation twenty years ago. Two main issues in RFID field are treated in this work. Initially, the variety of supports where the tags are placed on, fact that produce an antenna mismatch due to the electrical permittivity variation. For this problem some UHF tags solutions are developed and proposed to enhance the antennas performance for plastic and metallic supports applications. The second issue which is the low detection rate is clearly linked to the antennas coupling when the tags density is high or to the perturbations in the reader's radiation pattern due to the environment next to the antenna. In order to improve the detection-identification rate in these conditions, a four IFA miniaturized reader antenna with diversity is developed and tested

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Saba, Rita. "Caractérisation et conception de tags RFID-UHF dédiés aux produits textiles." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4783.

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Cette thèse s’inscrit dans le cadre d’une collaboration entre l’IM2NP et la société Tagsys, dans le cadre du projet PACID-TEXTILE. L'objectif de la thèse est de créer un tag RFID UHF packagé, très robuste et qui puisse facilement s’intégrer de manière discrète dans les produits textiles. L’idée est de concevoir deux antennes couplées et adaptées aux puces choisies pour l’application. Ces deux antennes sont conçues afin de favoriser le couplage entre elles. La première entité est packagée afin de protéger la puce de l’environnement d’utilisation. Dans une première partie, l’antenne primaire est caractérisée. Le packaging fait l’objet d’études particulières pour répondre aux contraintes de robustesses liées aux domaines du textile (blanchisserie, produit chimique). Une seconde partie du travail vise à caractériser le fil conducteur de manière à en établir une modélisation la plus fidèle possible pour pouvoir être utilisé par les outils de simulation et de conception d’antennes. Des essais de résistances du fil sont également réalisés.Enfin, une troisième partie traite de la conception d'antennes. Les tags conçus doivent avoir une portée minimale de 4m, résister à la déformation et à l'empilement. Ces tags sont soumis à différents tests pour établir leurs performances. A l’aide des moyens de caractérisations disponible au laboratoire IM2NP (plate forme de pré certification RFID), un « Benchmarking » est réalisé sur les différents tags en vue de proposer une étiquette répondant au mieux aux exigences du cahier des charges
This thesis is part of a collaboration between the company Tagsys and IM2NP, under the PACID-TEXTILE project. The aim of the thesis is to create a robust UHF RFID tag antenna that can be easily and discreetly integrated into textile products.The idea is to design two antennas electromagnetically coupled and adapted for selected chips. Both antennas are designed to facilitate the coupling between them. The first antenna is packaged in a robust material in order to protect the chip from laundry cycles. The second antenna is made up by electro-thread. The first part of the work is to characterize the packaged antenna and packaging material. The second part is to measure the conductivity of the used thread, to establish the most accurate model possible. Tests of wire resistance are also made. Toughness of each wire is also tested.The third part deals with the antenna design. The tags are designed to have a minimum range of 4m. They have to resist deformation and stacking. These tags are subjected to various tests to determine their performance. Using resources available in the laboratory IM2NP (RFID platform), a "Benchmarking " is carried on different tags to find the best that meet the requirements of the specifications

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Alarcon, Juvenal. "Conception d'antennes et de tags RFID UHF pour environnements hostiles, application au projet RFID AERO." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4703.

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Cette thèse s'inscrit dans le cadre du projet collaboratif FUI RFID AERO dont le leader est Eurocopter. Le but de ce projet est le développement d'un système assurant la traçabilité des différentes pièces d'un aéronef. Cette thèse se focalise sur la conception d'antennes lecteur et de tags RFID UHF faible coût.Deux objectifs sont visés dans le cadre de cette thèse. Le premier est la conception d'antennes pour lecteurs RFID fonctionnant en contact ou à proximité des surfaces métalliques. Nos conceptions sont basées d'une part sur les phénomènes d'ondes constructives en plaçant une surface métallique à un quart de la longueur d'onde. D'une autre part, la conception repose sur l'utilisation de structures AMC. De plus, nous proposons une méthode de réduction de dimensions de cellules AMC. Le second objectif de la thèse est la miniaturisation de tags pour l'identification de pièces essentiellement métalliques. Nous proposons des méthodes de conception de tags miniatures durcis, non détachables ou flexibles ainsi qu'un prototype pour chacune d'entre elles.Enfin, les antennes lecteur et tags développés dans cette thèse, les lecteurs RFID et des systèmes connexes développées par d'autres partenaires ont été mis en œuvre dans un aéronef. Les tests du système complet sont satisfaisants et répond aux objectifs du projet
This Ph.D thesis is part of the FUI RFID AERO project led by Eurocopter. The aim of this project is to provide a traceability system of the aircraft items. This work focuses on low-cost UHF RFID reader antennas and tags design.Two research axes are developed. The first one is the RFID reader antennas design for metallic surfaces. The designs are based on constructive wave phenomenon by placing a metallic plate at a quarter wavelength of the radiating element. On the other hand, the insertion of AMC structures was also studied. Furthermore, we propose a size reduction technique for AMC structures. The second goal is tag size miniaturization for metallic or non-metallic objects identification. We propose design methods of size miniaturization for hard or flexible tags. Besides, we apply these methods by designing one tag for each family.Finally, the reader antennas and tags proposed in this thesis, the RFID readers and the related systems developed by the others partners were implemented into an aircraft. Tests of the complete system are in good agreement with the expected goals

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Ghetti, Gabriele. "Localizzazione di tag passivi non lineari." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14276/.

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In questo lavoro di tesi è stato realizzato un software di elaborazione dei segnali ricevuti da una etichetta (tag) RFID chipless con l’obiettivo di stimare la distanza del tag rispetto alla posizione dei ricevitori. Questo progetto trova importanti applicazioni legate alla localizzazione sia in ambito hi-tech che di largo consumo, come ad esempio la logistica, l’automotive e i sistemi di automazione. In questo progetto è stato curato specificamente il processo di acquisizione ed elaborazione dati, processando al calcolatore con l’ausilio del software MATLAB® i risultati provenienti da un simulatore circuitale del tag. In particolare, i dati da elaborare sono stati forniti da un progetto di ricerca correlato a questo dove è stato studiato e realizzato un tag RFID chipless passivo di tipo armonico non lineare.

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Kam, ChiWeng. "902-928MHz UHF RFID Tag Antenna Design, Fabrication and Test." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/598.

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Radio Frequency Identification (RFID) uses RF radiation to identify physical objects. With decreasing integrated circuit (IC) cost and size, RFID applications are becoming economically feasible and gaining popularity. Researchers at MIT suggest that RFID tags operating in the 900 MHz band (ultrahigh frequency, UHF) represent the best compromise of cost, read range, and capabilities [1]. Passive RFID tags, which exclude radio transmitters and internal power sources, are popular due to their small size and low cost [1]. This project produced Cal Poly’s first ever on-campus printed, assembled, and operational UHF (902 to 928 MHz) passive RFID tag. Project goals include RFID tag antenna design and simulation using the EMPro electromagnetic (EM) simulation tool [47], establishing the tag fabrication process, and testing, operational verification, and comparisons to commercial tag performance. The tag antenna design goal is to meet or exceed the read range performance of the commercial Sirit tag [23] while minimizing the required tag conductive area. This thesis provides an overview of the UHF passive RFID tag fabrication process. Cal Poly’s Graphic Communication Department Laboratory applied a screen‑printing process to print RFID tag antenna patterns onto plastic (PET) substrates. RFID IC-substrate packages were manually attached to tag antennas with conductive adhesives and functionally verified and compared to commercial tag performance. RFID tag antennas were impedance matched (using EMPro) to the Monza 3 RFID IC to maximize IC to antenna power transfer and RFID tag read range.Tag antenna read range (maximum reader-tag communication distance) was characterized in Cal Poly’s Anechoic Chamber, while RFID tag matching characteristics were measured using the differential probe method [33-41] and compared to simulations. Read range results indicate that one of the designs developed in this thesis outperforms a commercial UHF RFID tag.

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Pires, Walter Alexandre Ribeiro. "Antenas inteligentes em têxteis." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/18709.

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Mestrado em Engenharia Eletrónica e Telecomunicações
A tecnologia RFID tem vindo a ganhar popularidade no mercado global atual, dado que a capacidade de comunicação por ondas de rádio com praticamente qualquer objeto, a simplicidade, credibilidade e reduzido custo justi cam o crescente interesse e investimento nesta tecnologia. A indústria têxtil é um setor de atividade extenso e multifacetado, que desenvolve e fabrica produtos para aplicações bastante diferenciadas, onde a aplicabilidade da tecnologia RFID pode trazer inúmeras vantagens nesta indústria, uma vez que a aposta em inovação, tanto em materiais como em tecnologias, permite a diferenciação e valorização desta indústria. A presente dissertação propõe o desenvolvimento de três tags RFID: uma desenvolvida apenas em substrato FR-4, outra desenvolvida somente em substrato têxtil, e por último, uma desenvolvida conjuntamente em substrato FR-4 e têxtil. Esta última constituiu o objeto principal de estudo, onde em conjunto com as outras duas tags, serviram como meio de comparação em termos dos resultados obtidos por cada uma delas. Em suma, conseguiu-se chegar a uma solução nal viável, com o desenvolvimento de uma tag RFID capaz de ser incorporada em têxtil para ns de identi cação, de dimensões 30 30 mm e passível de ser detetada a 3:8 metros.
RFID technology has been gaining popularity in the current global market because the ability that radio waves have to communicate with nearly any object, its simplicity, credibility and low cost justi es the increasing interest and investment in this technology. The textile industry is an extensive and multifaceted activity sector that develops and manufactures products to a wild range of applications, where the applicability of RFID technology can bring numerous advantages to it, since innovation in both materials and technologies allows di erentiation and appreciation to this industry. The present dissertation proposes the development of three RFID tags: one developed only on FR-4 substrate, one merely on textile substrate and nally one developed using both substrates (textile and FR-4). This last one was the main object of study, where together with the other two tags, served as means of comparison in terms of results obtained by each of them. In sum, a viable nal solution was achieved through the development of an RFID tag capable of being incorporated onto a textile substrate for identi - cation purposes, with dimensions of 30 30 mm and susceptible of being detected at 3; 8 meters.

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Wolk, Jonathan E. "Graphical real-time simulation tool for passive UHF RFID environments." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33381.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.
Includes bibliographical references (p. 115-117).
In this thesis, I present the design and implementation of a real-time simulation tool, RFID Vis, that is used to simulate a UHF RFID environment. The simulation tool simulates environments containing to pallets of cases as is common in parts of the supply chain. The simulation tool consists of two parts, a graphical front end which interfaces with the user as well as displays the electromagnetic power present in a given volume of space in an intuitive manner and an electromagnetics simulation engine which takes care of all the electromagnetic calculations and approximations. The simulation tool is written in C++ using Microsoft DirectX 9.0 to interface with the graphics hardware. RFID Vis enables users to quickly simulate a real world operating scenario providing insights and building intuition.
by Jonathan E. Wolk.
M.Eng.

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26

Novotný, Jan. "Zpracování signálu UHF RFID čtečky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221225.

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The master’s thesis is focused on the UHF RFID reader EXIN-1 signal processing. The first part describes the concept of the EXIN-1 front end, its basic testing and possible communication interfaces for reader control and for receiving and transmitting baseband signals. The second part of this work is aimed to a simple description of EPCglobal Class-1 Generation-2 UHF RFID Protocol, especially to used modulations and codings. In the last part, a block connection between the front end and an ARM Cortex-M4 microcontroller discovery board is designed. The microcontroller is used for generating of all required signals and also for receiving incoming signals and processing them for identification numbers of RFID cards (tags), which are in the reading range of the reader. A decoding algorithm is designed in MATLAB software and implemented to the selected microcontroller. Obtained identification data are displayed on an LCD display and also sent to a PC through a serial communication.

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Kanwar, Kelash [Verfasser]. "Identification of rubber belts in harsh environments using UHF RFID tags / Kelash Kanwar." Paderborn : Universitätsbibliothek, 2015. http://d-nb.info/1075602246/34.

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Ghiotto, Anthony. "Conception d'antennes de tags RFID UHF : application à la réalisation par jet de matière." Phd thesis, Grenoble INPG, 2008. http://www.theses.fr/2008INPG0148.

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L'identification par radiofréquence constitue une technologie émergente et très prometteuse pour l'identification des biens et des personnes : automatisation des opérations manuelles, rapidité, informations précises. . . Il existe plusieurs technologies RFID. Dans cette thèse, nous nous intéressons à la technologie UHF passive et plus particulièrement à la conception, caractérisation et fabrication des antennes de tags RFID. En 2007, il s'est vendu plus de 1,7 milliard de tags RFID. En vue de réduire le coût de ces derniers, nous abordons leur fabrication par une technique très prometteuse qui pourrait révolutionner l'électronique, le jet d'encre. Ces travaux s'appuient sur des simulations électromagnétiques et des mesures, et considèrent différents types d'antennes RFID
Radiofrequency identification is an emerging and promising technology for the identification of individuals and goods: the automation of manual operation, rapidity, precise information. . . Differents RFID technologies exist. In this thesis, we are interested in the passive UHF RFID technology and especially to the design, characterization and fabrication of RFID antennas. In 2007, over 1. 7 billion of RFID tags were sold. To lower their cost, we investigate their fabrication using ink jet printing, a technique that could revolutionize electronics industry. This work is issued from electromagnetic simulations and measurement considering several kinds of RFID antennas

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Frushour, John H. "Design considerations for a computationally-lightweight authentication mechanism for passive RFID tags." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FFrushour.pdf.

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Thesis (M.S. in Computer Science)--Naval Postgraduate School, September 2009.
Thesis Advisor(s): Fulp, J.D. ; Huffmire, Ted. "September 2009." Description based on title screen as viewed on November 6, 2009. Author(s) subject terms: Passive RFID Systems, Tags, Clock, Electro-magnetic induction, authentication, hash, SHA--1. Includes bibliographical references (p. 59-60). Also available in print.

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Souza, Aline Coelho de. "Conception d’antennes et méthode de caractérisation des systèmes RFID UHF en champ proche et en champ lointain." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT095/document.

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La technologie d'identification par radiofréquence (RFID) a eu un essor très important ces dernières années notamment grâce à sa configuration polyvalente et aux innombrables possibilités d'intégration offertes par cette technologie notamment avec l'apparition d'un nouveau contexte applicatif celui des objets connectés. Depuis quelques années, des applications de la RFID UHF en champ proche ont été notamment développées afin de surmonter les problèmes liés à la dégradation de lecture des tags lorsqu'ils sont placés dans des milieux fortement perturbateurs. Les travaux de recherche présentés dans cette thèse s'intéressent à l'étude de la technologie RFID UHF en zones de champ proche et de champ lointain. Les études portent plus particulièrement sur la conception d'antennes lecteur et d'antennes tag ainsi que sur les méthodes de caractérisation des systèmes RFID en zones de champ proche et de champ lointain. Une étude sur les caractéristiques des champs rayonnées par une antenne est réalisée afin de souligner les critères les plus pertinents en vue de concevoir des antennes pour les lecteurs RFID, performantes en zone de champ proche. A partir de l'état de l'art sur les antennes tags et les méthodologies de conception classiques, une nouvelle approche de conception est développée qui vise à améliorer la conception d'antennes tags en intégrant une vision appropriée pour tenir compte du niveau de puissance espéré dans une application donnée. Enfin avec pour objectif la caractérisation des tags RFID UHF, d'une part une approche est proposée permettant l'identification de familles de tags, et d'autre part, une procédure innovante pour la mesure de l'efficacité du transfert de puissance est proposée et validée expérimentalement
The Radiofrequency Identification technology (RFID) has had a huge growth these last years, due to its versatility and the uncountable possibilities to integrate this technology in many different application (tracking and inventory of goods, access control, supply chain, etc.), and in particular the brand new context of internet of things projects. For some years, the near field UHF RFID applications has been developed in order to overcome the problems related to degradations of tag's read range when needing to use it in a perturbing environment. The research work presented in this thesis come as a study of the UHF RFID in near field and far field zones. This study focus more particularly on the design of reader and tag antennas and on the characterization method in near field and far field zones. A study on the characteristics of fields outgoing from an antenna has been made, in order to underline the important criteria for the design of performant UHF RFID reader antennas in near field zone. From the state of art about tag antennas design and classical methodologies, we propose a new approach that aims improving the design of tag antennas in a more suitable point of view that is getting the expected power level in a given application. Finally, with an objective to characterize UHF RFID tags, we first propose a new approach enabling the identification of tag families, and then propose a new innovating power transfer efficiency measurement procedure, that has been validated experimentally

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Sharif, Bakhtiar Alireza. "An efficient CMOS RF power extraction circuit for long-range passive RFID tags." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/33712.

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Effective matching and efficient power conversion play key roles in long- range power telemetry. This thesis discusses challenges and suggests solutions for long-range power telemetry with an emphasis on radio-frequency identification (RFID) applications. As a proof-of-concept a radio-frequency (RF) power harvesting system in a 0.13-µm CMOS technology is designed, fabricated, and successfully tested. The RF power harvesting system must maintain matching over the the wide operation frequency range of passive RFID tags, mandated by EPC- global. In this work, we first analyze the series-inductor matching network and show that there is a trade-o between bandwidth and efficiency. We then derive some guidelines for matching circuit design for RFID tags. To solve the matching problem over a wide frequency range, an adaptive matching system is proposed. At the startup, this system turns on while the rest of the chip is still inactive, and automatically tunes the matching network to achieve its maximum output voltage. Then the rest of the chip wakes up and functions as normal. A new CMOS rectifier stage is also proposed. This stage is capable of efficient operation even with very low input powers. In addition, this rectifier stage can be cascaded to reach higher output voltages without significantly compromising the overall efficiency. Combination of low-power performance and cascadability makes this rectifier suitable for long-range RFID tags. The test setup and measurement results are also discussed in a separate chapter. The measurement results show a 50% rectifiers efficiency at 4-µW input power. To the best of our knowledge, to date, this is the highest efficiency reported for rectifiers operating at such a low input power. Also, as compared to the output voltage at the nominal center frequency of the input matching network, the system shows less than 6% drop in output voltage over the entire 55-MHz bandwidth of the system which verifies the effectiveness of adaptive matching.

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Da, Rocha Marques Daniel. "Conception d'antenne tag sur le corps humain et d'antenne lecteur en RFID UHF." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4325.

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Cette thèse s’inscrit dans le cadre du projet collaboratif FUI VEADISTA. Le but de ce projet est le développement d’une solution technologique à bas coût pour la veille à distance de personnes fragiles. Cette thèse se focalise sur la conception d’antennes lecteur et d’une étiquette RFID UHF posée sur le corps humain. Deux objectifs principaux sont visés dans ces travaux de thèse. Le premier aborde la conception d’antennes pour lecteurs RFID, le second aborde la conception d’une antenne large bande, pour une étiquette RFID, adaptée au corps humain. Les objectifs à atteindre pour l’antenne lecteur sont : un champ rayonné à polarisation circulaire, un gain élevé, faible coût de fabrication et faible épaisseur. Pour atteindre ces objectifs, une topologie d’anneau fente miniaturisé par une méthode itérative de repliement d’anneau associée à un réflecteur incluant un AMC à cellules élémentaires réduites sont employés. Le second objectif de la thèse est la conception d’une antenne large bande, pour une étiquette RFID, capable de minimiser l’influence du corps humain sans sacrifier la distance de lecture tout en restant faible coût. Un modèle électromagnétique d’avant-bras humain est utilisé comme support de conception de l’antenne tag large bande. Enfin le système RFID complet incluant, l’étiquette, l’antenne lecteur et le lecteur RFID ont fait l’objet de tests fonctionnels pour préparer les tests cliniques sur patient
This thesis was initiated within the VEADISTA project. The main goal of this project was to develop a cost effective technological remote care system for fragile person. The main focus of this thesis is on antenna design for RFID reader and also for RFID tags in contact with human body. For the reader antenna the criteria are: a circularly polarized radiated field, high gain, cost effectiveness and small thickness. To achieve these objectives, a miniaturized slot ring topology obtained by an iterative method of ring folding associated with a reflector including a reduced unit cells AMC are used. For the tag the objective is to design a broadband antenna, by minimizing the influence of human body without affecting the reading scope. The tag is needed to also be cost effective. An electromagnetic model of human forearm is used as the broadband tag antenna design support. Ultimately, the functionality of the complete system including a tag and a reader have been tested

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Li, Tzu Hao. "Open Platform Semi-Passive Ultra High Frenquency Radio Frequency Identi." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20060.

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Radio frequency identi cation (RFID) is a rapidly emerging technology that enables au- tomatic remote identi cation of objects. Passive and semi-passive RFID systems can be distinguished from other forms of wireless systems, because the RFID tags (transponders) communicate by way of backscatter. In addition, passive tags derive their energy from the RF energy emitted by the reader. RFID technology can provide a fully automated data capture and analysis system. Compared to a passive RFID system, an open platform semi-passive UHF RFID tag can provide identi cation, security, low-power (compared to a wireless sensor net- work(WSN)), medium range and medium processing speed. However, the eld of semi- passive RFID is still under development, and has yet there are no open development platforms available. This thesis develops a prototype of a semi-passive UHF RFID tag that is compatible with the leading UHF RFID standard EPCglobal Gen 2 Class 1. I alsot has the exible I2C and analog digital converter(ADC) interface, which allows the additional of external analog and digital sensors. The sensor data can be read by microcontroller and stored at memory. Standard reader can get sensor data by sending QUERY and READ command to tag. Test results of our open platform semi-passive UHF RFID tag demonstrated that it can achieve a read rate above 50% when an open platform semi-passive UHF RFID tag is placed four meters from the reader antenna and the reader output power is set to 21 dBm. In addition, the proposed semi-passive open platform RFID tag consumes very little power (4.9 mA in 2V with system frequency set to 8MHz).

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Battistini, Nicholas. "Digital design of an EPC Gen2 controller for enhanced RFID tags." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19641/.

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This thesis presents an improvement of the long range battery-less UHF RFID platform for sensor applications which is based on the open source Wireless Identification and Sensing Platform (WISP) project. The purpose of this work is to design a digital logic that performs the RFID EPC gen2 protocol communication, is able to acquire information by sensors and provide an accurate estimation of tag location ensuring low energy consumption. This thesis will describe the hardware architecture on which the digital logic was inserted, the Verilog code developed, the methods by which the digital logic was tested and an explorative study of chip synthesis on Cadence.

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Rakotomalala, Imbolatiana. "Lecture de Tags miniatures pour les environnements électromagnétiques sévères." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT048.

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La conception et la réalisation de tags RFID, notamment UHF, optimisés pour une application donnée a été, et reste un moteur de nombreux travaux de R&D, aussi bien au niveau académique qu’au niveau industriel. Lors de la dernière décennie ces développements se sont concentrés sur deux visions complémentaires, mais assez différentes en termes d’objectif final. L’une favorisant l’optimisation de l’antenne du tag alors que l’autre se concentrait sur les performances de la puce RFID. Dans cette thèse nous allons explorer une voie nouvelle qui vise la lecture de tags de dimensions très réduites pour des objets de nature métallique, placés dans un environnement métallique fermé et entièrement passif. Le travail présenté dans cette thèse se partage ainsi en deux axes. Le premier est consacré à l’étude et le développement de solutions pour transférer sans contact de signaux RFID dans le but d’alimenter des tags RFID dans un environnement métallique confiné. Le deuxième est dédié à la lecture des tag RFID miniature pour des petits objets métallique, à savoir le développement de solutions passives, permettant de lire efficacement des tags RFID miniatures placé sur des petits objets métalliques. Dans les deux aspects de notre travail, des considérations pratiques tel que le coût, l’intégration et la performance ont été évoqué dans le but d’obtenir une solution finale, que l’on peut produire à grande échelle pour l’industrie
The design and production of RFID tags, particularly UHF, optimized for a given application has been and remains a driving force behind many R&D projects, both at the academic and industrial levels. Over the last decade, these developments have focused on two complementary visions, but quite different in terms of final objective. One favored the optimization of the tag antenna while the other focused on the performance of the RFID chip. In this thesis, we explore a new way to read very small tags for metallic objects, placed in a closed and entirely passive metallic environment. The work presented in this thesis is thus divided into two axes. The first one is dedicated to the study and development of solutions for the contactless transfer of RFID signals in order to feed RFID tags in a confined metallic environment. The second one is dedicated to the development of passive solutions to efficiently read miniature RFID tags placed on small metal objects. In both aspects of our work, practical considerations such as cost, integration and performance have been addressed in order to achieve a final solution that can be produced on a large scale for the industry

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Holland, William S. "Development of an Indoor Real-time Localization System Using Passive RFID Tags and Artificial Neural Networks." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1249062541.

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Liu, Ran [Verfasser]. "Mapping, Path Following, and Perception with Long Range Passive UHF RFID for Mobile Robots / Ran Liu." Aachen : Shaker, 2018. http://d-nb.info/118659019X/34.

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38

Flieger, Matthias Ludwig. "Entwicklung, Modellierung und Verifikation einer Dual-Feed-Antennenstruktur für leistungsfähige, passive UHF-RFID-Sensoren auf kritischen Oberflächen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-120227.

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Die Weiterentwicklung klassischer, elektronischer Identifikationstechnologien leistet einen wichtigen Beitrag zum technischen Fortschritt in Industrie, Logistik und Gesundheitswesen. Die vorliegende Dissertationsschrift beschreibt die Entwicklung eines Dual-Feed-Antennendesigns für passive UHF-RFID-Transponder auf kritischen Oberflächen. Die zu Grunde liegende Antennenstruktur besteht aus einem Microstrip-Patch unter Verwendung eines verlustarmen Substratmaterials. Dieser erfährt eine Optimierung hinsichtlich seiner Lesereichweite, insbesondere auf kritischen Oberflächen. Ein Zwei-Port-Konzept mit gekoppeltem Feed-Line-Anpassnetzwerk reduziert die Anzahl benötigter, diskreter Komponenten und ermöglicht eine kostengünstige Herstellung mittels klassischer Ätzverfahren. Verschiedene Ansätze zur Modellierung und zur analytischen Berechnung der Antennenparameter werden dargestellt. Des Weiteren erfolgt eine Verifikation der Antennenstruktur anhand eines Konzepts für einen passiven Energy-Harvesting-RFID-Transponder, der zur Temperaturüberwachung in den genannten Branchen eingesetzt werden kann. Dieses Konzept schließt ein effizientes Energiemanagement mittels eines Ultra-Low-Power-Mikrocontrollers sowie Ansätze zur Energiegewinnung und -speicherung mit ein und stellt die Wahl wichtiger Systemparameter und Bauelemente anhand anwendungsspezifischer Abschätzungen dar.

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Rumens, Christina Victoria. "The integration of stimulus-responsive polymers into passive Ultra-High Frequency Radio Frequency Identification (UHF-RFID) sensors." Thesis, University of Kent, 2016. https://kar.kent.ac.uk/62467/.

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Liu, Ran [Verfasser], and Andreas [Akademischer Betreuer] Zell. "Mapping, Path Following, and Perception with Long Range Passive UHF RFID for Mobile Robots / Ran Liu ; Betreuer: Andreas Zell." Tübingen : Universitätsbibliothek Tübingen, 2014. http://d-nb.info/1163282367/34.

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Nordström, Edward, and Johan Hollander. "Design och implementering av enhandsburen RFID-läsare." Thesis, Jönköping University, JTH, Computer and Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-6752.

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Radio frequency identification (RFID) is a versatile wireless technology usedworldwide. The fields of applications are many and its popularity constantlygrows due to smaller in size, better and less expensive components. RFID isused to identify, track or share information about an object using radio waves.

This master thesis describes the process of designing and implementing ahandheld UHF RFID reader. The goal was to, based on a UHF RFID-chipdesign a fully functional, small in size and power efficient device. Amicrocontroller provides the user interface and is also used to control theRFID-chip and a Bluetooth device. A Bluetooth- and GPRS-compatible mobilephone will be used to forward data to a server connected to the Internet. Allparts of the design are described, such as the printed circuit board design aswell as the software for the micro controller and the mobile phone.

Because the extent of this thesis it is neither possible nor necessary to dig toodeep into the Bluetooth- or GPRS-protocol. The focus will be on designingsoftware and hardware for the handheld unit.

Radio frekvens identifiering (RFID) är en mångsidig trådlös teknik somanvänds över hela världen. Områdena där tekniken används är många och dess popularitet växer konstant tack vare mindre storlek, bättre och billigarekomponenter. RFID används för att identifiera, spåra eller dela med siginformation om ett objekt med radiovågor.

Det här examensarbetet beskriver processen av design och implementering aven handburen UHF RFID läsare. Målet har varit att, baserat på ett UHF-RFIDchip, designa en fullt fungerande, liten och strömsnål enhet. En microcontroller förser dels användaren med ett användargränssnitt och sköter delskommunikationen med RFID chip och en blåtandsmodul. En blåtands- ochGPRS- eller 3G-kompatibel mobiltelefon används for att skicka vidare data tillen server kopplad till Internet. Alla delar av designen är beskrivna, så som PCB design, mjukvara för micro controllern och mobiltelefonen.

På grund av omfattningen av det här examensarbetet så har det inte varitmöjligt eller nödvändigt att gräva för djupt i Blåtands- eller GPRS/3Gprotokollen. Fokus är på att designa hårdvara och mjukvara för den handhållna enheten.

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Kalayci, Sefa. "Design Of A Radio Frequency Identification (rfid) Antenna." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610554/index.pdf.

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Fundamental features of Radio Frequency Identification (RFID) systems used in different application areas will be reviewed. Techniques used in realizing RFID antenna systems will be studied and the procedure to realize a specific RFID antenna type possessing desired characteristics will be described. Electrical properties such as radiation pattern, impedance will be predicted using analytical and/or computer simulation techniques. Experimental investigations will be carried out to complement the theoretical work.

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Flieger, Matthias Ludwig [Verfasser], Thomas [Akademischer Betreuer] Geßner, Thomas [Gutachter] Geßner, and Helmut [Gutachter] Seidel. "Entwicklung, Modellierung und Verifikation einer Dual-Feed-Antennenstruktur für leistungsfähige, passive UHF-RFID-Sensoren auf kritischen Oberflächen / Matthias Ludwig Flieger ; Gutachter: Thomas Geßner, Helmut Seidel ; Betreuer: Thomas Geßner." Chemnitz : Universitätsbibliothek Chemnitz, 2013. http://d-nb.info/1214245994/34.

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Butt, Munam. "Systemization of RFID Tag Antenna Design Based on Optimization Techniques and Impedance Matching Charts." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23064.

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The performance of commercial Radio Frequency Identification (RFID) tags is primarily limited by present techniques used for tag antenna design. Currently, industry techniques rely on identifying the RFID tag application (books, clothing, etc.) and then building antenna prototypes of different configurations in order to satisfy minimum read range requirements. However, these techniques inherently lack an electromagnetic basis and are unable to provide a low cost solution to the tag antenna design process. RFID tag performance characteristics (read-range, chip-antenna impedance matching, surrounding environment) can be very complex, and a thorough understanding of the RFID tag antenna design may be gained through an electromagnetic approach in order to reduce the tag antenna size and the overall cost of the RFID system. The research presented in this thesis addresses RFID tag antenna design process for passive RFID tags. With the growing number of applications (inventory, supply-chain, pharmaceuticals, etc), the proposed RFID antenna design process demonstrates procedures to design tag antennas for such applications. Electrical/geometrical properties of the antennas designed were investigated with the help of computer electromagnetic simulations in order to achieve optimal tag performance criteria such as read range, chip-impedance matching, antenna efficiency, etc. Experimental results were performed on the proposed antenna designs to compliment computer simulations and analytical modelling.

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Lin, Ying-Te, and 林穎德. "Performance Testing Method for RFID UHF Passive Tags." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/n4f3k7.

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碩士
國立臺北科技大學
機電整合研究所
99
The general manufacturing production machine of UHF passive RFID, the technology of online inspection is used in near field to read the serial number tag successfully or not in order to measure that the electronic tag is good or bad and to determine high and low production quality, but it cannot show further tag performance. This study research provides a short distance performance testing method by using passive tag and use the EPCglobal static test method to measure the turn on power, and test received signal strength indication in this condition. By the transfer method proposed in this study can get the longest steady reading distance; this method not only can help business owners to process the real-time online quality inspection, but also can grad in product manufacturing to reduce customer complaints and enhance product applications .

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Chang, Cheng-Hung, and 張正弘. "Tags design and RCS analysis for passive UHF RFID." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/39259164184862478873.

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碩士
元智大學
通訊工程學系
96
This thesis is devoted to the design, fabrication and testing of tags for passive UHF radio-frequency identification (RFID) system. RI-UHF-STRAP-08 form TI is identified at the chip IC strap for the tag due to its relative low DC power consumption. While the chip impedance of the tag IC was characterized through TRL calibrated measurement system, complex conjugate matching technique at desired frequency was adopted. In order to achieve good power match, across the entire frequency band of operation, quasi log-periodic antenna scheme was implemented . The tested maximum readable was measured to be 4.5m at EIRP=4W output level.

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Gautham, Ananyaa. "Practical evaluation and analysis of passive UHF RFID tags." 2008. http://hdl.handle.net/10106/1002.

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Atojoko, Achimugu A., Raed A. Abd-Alhameed, Yuxiang X. Tu, Fauzi Elmegri, Chan H. See, and Mark B. Child. "Automatic liquid level indication and control using passive UHF RFID tags." 2014. http://hdl.handle.net/10454/10596.

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Li, Ming-hsiang, and 李明翔. "MIMO UHF Passive RFID Tag." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/04760303539379187919.

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碩士
國立臺灣科技大學
電機工程系
103
Due to the long read range, the performance of Ultra High Frequency (UHF) Identification (RFID) system can be easily affected by multi-path fading. To overcome the preceding problem, a MIMO UHF passive RFID tag, operating at 925 MHz, complied with the regulation of Taiwan, is proposed in this thesis. With different polarizations of transmitter, we measure the tag backscatter power .The experimental results verify the effects of tag against multi-path fading. The structure of the dual antenna tag is referred to the structure of analog front-end circuit of Wireless Identification and Sensing Platform (WISP) and the 　semi-passive dual antenna tag design in Lin’s thesis and optimized becoming a passive dual antenna tag. Furthermore, we add the quantization function of Received Signal Strength Indicator (RSSI) on MSP430. Thus, the quantized values can be transmitted to receiver by Space-Time Block Code, STBC. In addition, because of the difference pattern of backscatter of the improving tag, compared with tag proposed by previous literature, the reader we used before is not available to analyze the data. Therefore, the effects are verified by measuring, observing and analyzing the energy variation.

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Ko, Yi-Hsin, and 柯宜欣. "A Highly Efficient UHF Passive CMOS RFID Tag." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/9636kw.

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Abstract:

碩士
國立臺灣科技大學
電機工程系
99
This thesis presents an UHF passive radio-frequency-identification (RFID) tag chip. This tag is applicated in RFID indoor localization system. The system operates at dual bands: the 2.45GHz continue wave for charge the tag and backscattering the RF data to the Reader; the other band, 925MHz or 866.4MHz for receiving and decoding the modulated signal. For the indoor localization system, this thesis designs a low power consumption RFID Tag. We remove the regulator and the oscillator, which are known to consume a large amount of power. The lowest RF power that our Tag can work is -23dBm. Since the PIE symbol is self-timing, this thesis presents a new method to decode PIE symbols to binary codes. The proposed RFID tag is designd in TSMC 0.18μm 1P6M CMOS process in Full-Custom design flow.

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Dissertations / Theses on the topic 'Passive UHF RFID tags'

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