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1
Page, Michael John. "The analysis and design of n-port microstrip planar disk devices." Thesis, University of Hull, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333767.
Повний текст джерела
2
Dorosh, Anastasiia. "Design of Microstrip Microwave Devices with Lumped Elements by Means of Modern CADs." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-30365.
Повний текст джерелаАнотація:
In this report the analysis of microstrip electrodynamic structures on basis of high-temperature superconductors is carried out and a mathematical model of microstrip devices with lumped and distributed nonlinear properties is created. For this purpose nonlinear integral equations method and method of moments are used. In the issue of the work a SHF filter based on the equivalent circuit of elements with lumped parameters is also studied. It is ascertained that the received mathematical model allows to achieve more proper results of modeling on compensation of variation of current-density distribution nearby the edges of conductor break.
3
Pomarnacki, Raimondas. "Investigation of the electrodynamic retard devices using parallel computer systems." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20120106_101019-38158.
Повний текст джерелаАнотація:
An analysis using numerical methods can calculate electrical and construction characteristics parameters of microwave devices quite accurately. However, numerical methods require a lot of computation resources and time for calculations to be made. Rapid perfection of the computer technologies and software with implementation of the numerical methods has laid down the conditions to the rapid design of the microwave devices using computers.Disertacijoje nagrinėjamos mikrobangų įtaisų analizės ir sintezės proble-mos, taikant lygiagrečiąsias kompiuterines sistemas. Pagrindiniai tyrimo objektai yra daugialaidės mikrojuostelinės linijos ir meandrinės mikrojuostelinės vėlinimo linijos. Šie objektai leidžia perduoti, sinchronizuoti bei vėlinti siunčiamus signalus ir yra neatsiejama dalis daugelio mikrobangų prietaisų. Jų operatyvi ir tiksli analizė bei sintezė sąlygoja įtaisų kūrimo spartinimą. Pagrindinis disertacijos tikslas – sukurti lygiagrečiąsias metodikas ir algoritmus, skirtus sparčiai ir tiksliai atlikti minėtų linijų analizę ir sintezę. Sukurtų algoritmų ir metodikų taikymo sritis – mikrobangų įtaisų modeliavimo ir automatizuoto projektavimo progra-minė įranga.
4
Kulkarni, Shashank Dilip. "MoM modeling of metal-dielectric structures using volume integral equations." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0506104-111936/.
Повний текст джерела
5
Lozano, Castro Diego Enrique. "Investigation on electrically small antennas in the microwave range for the wireless transfer of power." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Знайти повний текст джерелаАнотація:
According to Ericsson’s Mobility report of November 2020, it is estimated that mobile subscriptions will increase to 8.8 billion by the end of 2026, of which 91 percent will be for mobile broadband. It is projected that the number of unique mobile subscribers be 6.4 billion by the end of the forecast period. Continuous growth in smartphone penetration and subscriptions associated with smartphones account for about 75 percent of all mobile phone subscriptions.
Such a huge growth in demand puts significant pressure on electronic and RF engineers, that need to develop compact, reliable devices in a fast way and at a low cost. Since, every bit of information, every bunch of sensor data is delivered through it, the antenna is a key component to develop a wireless portable device at the same time reliable and compact. In many instances, a conventional external monopole or dipole antenna is not an option, such as in wearable devices, trackers and many other applications cannot afford to feature a prominent element out of the device that can be unintentionally broken.
In this document, the fundamental limits on electrically small antennas are studied, where is described the impact of the quality factor in their size, bandwidth, and radiation efficiency.
In this document, planar technologies, and “antenna-less” technologies are presented as solutions providers for the proper integration of radiating systems in small wireless portable devices constructed in a way that the radiating system may be properly integrated, ensuring good wireless performance in terms of radiated power, received power sensitivity, and taking in consideration constraints such as the mechanical fit, electrical fit, and assembly fit. In this document, a real-life testing platform is compared and proved by the use of CAD tools, for circuital and EM simulations.
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SILVA, Leonardo Morais da. "Projeto de Acopladores Híbridos em Quadratura compactos por meio de linhas de transmissões artificiais." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/19878.
Повний текст джерелаАнотація:
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CAPES
O presente trabalho aborda o desenvolvimento e a implementação de acopladores híbridos em quadratura mais compactos e com largura de banda e desempenho similares as do acoplador branch-line convencional. Para isso, fez-se uso de uma classe de estruturas denominadas linhas de transmissão artificiais (LTA). Uma nova estrutura desse tipo, composta por três linhas de transmissão conectadas em cascata, é analisada e utilizada neste trabalho. Foram derivadas equações matemáticas para o projeto deste tipo de estrutura que podem ser utilizadas para obter LTAs com uma matriz de espalhamento idêntica, para uma dada frequência de operação, a de uma linha de transmissão com uma impedância característica e comprimento elétrico quaisquer. Essa técnica foi aplicada no projeto de acopladores híbridos em quadratura em microfita para as bandas GSM em 920 MHz e ISM em 2.45 GHz usando-se o substrato FR-4 com espessura de 1.6 mm. Obteve-se dispositivos com áreas aproximadamente 70% menor do que a área do acoplador branch-line convencional operando em 920 MHz e aproximadamente 50% menor do que o acoplador de 2.45 GHz. Os acopladores obtidos foram simulados, fabricados e medidos, mostrando que os seus desempenhos são comparáveis aos dos acopladores convencionais. A técnica desenvolvida neste trabalho é geral o suficiente para ser aplicada ao projeto de outros dispositivos que usem trechos de linhas de transmissão.
This thesis is concerned with the design and implementation of compact hybrid couplers with similar bandwidth and performance to the conventional branch-line coupler. To achieve this, a class of structures, called artificial transmission line (ATL), was used. A new structure of this type, made of three transmission lines connected in cascade, is analyzed and used. Mathematical equations have been derived for the design of this type of structure that can be used to obtain ATLs with an identical scattering matrix, for a given frequency of operation, to that of a transmission line with a given characteristic impedance and electrical length. This technique was applied in the design of microstrip quadrature hybrid couplers for the 920 MHz GSM band and for the 2.45 GHz ISM band using a 1.6 mm-thick FR-4 substrate. These couplers have surface areas approximately 70% smaller than the area of the conventional branch-line coupler operating at 920 MHz and approximately 50% for the 2.45 GHz coupler. The couplers obtained were simulated, manufactured and tested, showing that their performances are comparable to the conventional coupler. The technique developed here is general enough to be applied to the design of other devices using transmission line sections.
7
Silva, Patric Lacouth da. "Modelagem de Superf?cies Seletivas de Freq??ncia e Antenas de Microfita utilizando Redes Neurais Artificiais." Universidade Federal do Rio Grande do Norte, 2006. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15517.
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Previous issue date: 2006-06-09Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
This work has as main objective the application of Artificial Neural Networks, ANN, in the resolution of problems of RF /microwaves devices, as for example the prediction of the frequency response of some structures in an interest region. Artificial Neural Networks, are presently a alternative to the current methods of analysis of microwaves structures. Therefore they are capable to learn, and the more important to generalize the acquired knowledge, from any type of available data, keeping the precision of the original technique and adding the low computational cost of the neural models. For this reason, artificial neural networks are being increasily used for modeling microwaves devices. Multilayer Perceptron and Radial Base Functions models are used in this work. The advantages/disadvantages of these models and the referring algorithms of training of each one are described. Microwave planar devices, as Frequency Selective Surfaces and microstrip antennas, are in evidence due the increasing necessities of filtering and separation of eletromagnetic waves and the miniaturization of RF devices. Therefore, it is of fundamental importance the study of the structural parameters of these devices in a fast and accurate way. The presented results, show to the capacities of the neural techniques for modeling both Frequency Selective Surfaces and antennas
Este trabalho tem como principal objetivo a aplica??o de Redes Neurais Artificiais, RNA, na resolu??o de problemas de dispositivos de RF /microondas, como por exemplo a predi??o da resposta em freq??ncia de algumas estruturas em uma regi?o de interesse. As Redes Neurais Artificiais se apresentam como uma alternativa aos m?todos atuais de an?lise de estrutura de microondas, pois s?o capazes de aprender, e o mais importante generalizar o conhecimento adquirido, a partir de qualquer tipo de dado dispon?vel, mantendo a precis?o da t?cnica original utilizada e aliando o baixo custo computacional dos modelos neurais. Por esse motivo, as redes neurais artificiais s?o cada vez mais utilizadas para a modelagem de dispositivos de microondas. S?o utilizados neste trabalho os modelos Perceptron de M?ltiplas Camadas e de Fun??es de Base Radiais. S?o descritas as vantagens/desvantagens de cada um desses modelos, assim como os algoritmos de treinamento referentes a cada um deles. Dispositivos planares de microondas, como Superf?cies Seletivas de Freq??ncias e as antenas de microfita, ganham cada vez mais destaque devido ?s necessidades crescentes de filtragem e separa??o de ondas eletromag?ticas e ? miniaturiza??o de dispositivos de R?dio-Freq??ncia. Por isso ? de import?ncia fundamental o estudo dos par?metros estruturais desses dispositivos de forma r?pida e precisa. Os resultados apresentados, demonstram as capacidades das t?cnicas neurais para modelagem de Superf?cies Seletivas de Freq??ncia e antenas
8
Rrustemaj, Etrur. "High speed communication devices using microstrips." Thesis, London South Bank University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618665.
Повний текст джерела
9
Noutehou, Nathan. "Conception de circulateurs et isolateurs pour des applications spatiales : nouvelles technologies d'intégration." Thesis, Brest, 2019. http://www.theses.fr/2019BRES0033/document.
Повний текст джерелаАнотація:
L’objectif de cette thèse est d’explorer de nouvelles technologies permettant de faciliter l’intégration des isolateurs dans les chaînes radiofréquences de satellites. Ces composants sont utilisés pour contrôler l’adaptation des amplificateurs dans les sections d’entrée et de sortie des équipements RF bas niveaux. Nous proposons deux voies de réalisation de ces isolateurs. Une première voie basée sur l’utilisation de matériaux ferricomposites est étudiée pour concevoir des composants en bande Ku. Une deuxième voie, basée sur l’utilisation d’hexaferrites de strontium et de baryum préorientés, a été étudiée pour concevoir des composants auto-polarisés (sans aimants) en bandes Q et KaThe goal of this PhD thesis is to explore new technologies that make possible to improve the integration of isolators in radiofrequency chain of satellites. These components are especially used to control matching of amplifiers.We propose two ways of producing these isolators. At first, ferricomposite materials are studied to design low-cost isolators at Kuband.Then, we studied pre-oriented strontium or barium hexaferrites to design self-biased components (without magnets) for Q and Ka band frequencies
10
Lindberg, Peter. "Wideband Active and Passive Antenna Solutions for Handheld Terminals." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7445.
Повний текст джерела
11
Paganestis, Antonios. "Investigation of the performance of microstrip gas detectors for X-rays and evaluation of their application to mammography." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266593.
Повний текст джерела
12
Luong, Duc Long. "Aide à la conception de lignes microrubans à onde lente sur substrat structuré dans les bandes RF et millimétriques : applications aux coupleurs et dispositifs passifs non-réciproques." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSES007/document.
Повний текст джерелаАнотація:
L’objectif de ces travaux est pour d’apporter des solutions innovantes à la réalisation de dispositifs passifs performants et compacts, susceptibles d’intéresser les concepteurs de circuits RF et millimétriques. Ces dispositifs sont basés notamment sur des lignes microrubans à ondes lentes sur substrat structuré, que cela soit sur PCB avec des vias borgnes pour la RF, ou nanostructurés sur membranes à nanofils pour le millimétrique. Les travaux complets comprennent (i) une analyse de la topologie, (ii) un développement du modèle équivalent validée par des simulations électromagnétiques (HFSSTM) et des mesures sur PCB et sur des membranes brésiliennes en millimétrique, (iii) des abaques de conceptions et (iv) des applications à la conception des nouveaux dispositifs passifs miniaturisés. Notre lignes offrent une grande souplesse de conception et peuvent être placées indifféremment sur le substrat structuré sans modification de leurs paramètres électriques. Un nouveau coupleur hybride miniaturisé par l’utilisation de cette ligne est présenté comme une preuve de concept. Pour aller plus loin, une étude comparable des structures de lignes microrubans couplées à ondes lentes est développée. Le principe du couplage sur substrat structuré est d’abord exposé avec une présentation de ses avantages et inconvénients, puis un modèle est également proposé dans le but de réaliser un coupleur co-directif 0-dB miniaturisé par l’utilisation de ces lignes. De plus, un des parties essentielles de ces travaux concerne l’utilisation de la structure microruban à onde lente pour la miniaturisation de dispositifs passifs non-réciproques : un nouvel isolateur microruban compact avec l’introduction de vias dans le ferrite et une nouvelle conception de circulateur miniaturisé sur le substrat ferrite-diélectrique avec un réseau de vias borgnesThis work focuses on providing innovate solutions into the realization of high-quality and compact passive devices for designer on RF and millimeter-wave bands. These devices are based on slow-wave microstrip lines on structured substrate, either on PCB with blind vias for RF applications, or on metallic nanowire membrane. The complete works include (i) an analysis of topology, (ii) a development of equivalent model validated by the electromagnetic simulations (HFSSTM) and the measurements, (iii) design charts and (iv) applications on design of novel miniaturized passive devices. These transmission lines give the flexibility for designers and capability to be indifferently placed on structured substrate without any impact on their electrical parameters. A novel miniaturized hybrid coupler using this line is proposed, as a proof of concept. In the other hand, a comparable study on the structure of slow-wave coupled microstrip lines is developed. The principal of coupling on structured substrate is shown for their advantages and drawbacks and then an electrical model is also proposed in order to realize a miniaturized 0-dB forward-wave directional coupler using these lines. Moreover, an essential part of this thesis concerns the utilization of the slow-wave microstrip structure to miniaturize the non-reciprocal passive devices: a novel microstrip isolator with the introduction of vias inside the ferrite and a novel design of the miniaturized circulator on a ferrite-dielectric substrate with blind vias
13
Haidar, Jihad. "Commande optoélectronique d'atténuateurs, de résonateurs et de filtres microondes réalises sur substrat silicium." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0094.
Повний текст джерелаАнотація:
La commande optique de dispositifs microondes, qui exploite l'injection optique des porteurs dans un semiconducteur, apporte de nombreux avantages vis-a-vis de l'electronique conventionnelle. La presente etude avait pour objectif d'etendre cette commande a des dispositifs, realisant des fonctions complexes, tels que les attenuateurs, resonateurs et filtres microondes. Les structures etudiees ont ete realisees sur du silicium en technologie ligne microruban. Nous avons exploite principalement la charge complexe induite entre le ruban et le plan de masse par illumination optique. Nous avons demontre que la lumiere cree principalement une charge resistive aux faibles puissances, mais qu'une composante reactive apparait aussi d'une maniere nette pour les puissances optiques elevees. L'effet resistif a ete mis en application dans la realisation d'un attenuateur microondes en technologie microruban, reglable par la simple commande optique. Nous avons demontre sur un premier prototype une plage d'attenuation superieure a 10db dans la bande c. Quant a l'effet reactif, nous avons introduit une commande supplementaire qui permet de le renforcer. Il s'agit de polariser le plasma photo-induit par une tension continue qui se superpose au signal hyperfrequences. Nous avons accorde la frequence de differents resonateurs par cette nouvelle double commande optoelectronique. Ces accords, sont, a notre connaissance, de loin les plus larges jamais reportes parmi les accords electriques. En effet, nous avons mesure des deplacements de la frequence de resonance de l'ordre de 30% en dessous de la frequence de resonance en l'absence d'illumination. L'etude est plutot de nature experimentale, mais des modeles theoriques simples ont ete developpes pour tenter d'expliquer les differents phenomenes nouveaux mis en evidence experimentalement. Nous avons reussi a etablir, d'une maniere satisfaisante en premiere approche, le lien entre les parametres physiques du semiconducteur d'une part et le schema equivalent du plasma photo-induit deduit de la reponse microondes du dispositif d'autre part
14
Peng, Chih-Chien, and 彭智堅. "Microstrip Antenna Designs for Wearable Communication Devices." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9k3b38.
Повний текст джерелаАнотація:
碩士正修科技大學
電子工程研究所
103
This thesis proposes the microstrip antenna dwsigns for watch applications in Wi-Fi 2.4GHz Band. The studies mainly reduce the interaction between the antenna and human body. The first design is a double layer structure. A microstrip line and an L-shape slot are printed on the upper and lower layer, respectively. The former is used for a coupling feed and the latter is used for a virtual shorted strip. The ground plane is bent into a stepped shape and effectively reduces the current distribution on the plane. This discontinuous structure degrades the interaction between human and antenna. Stable radiation performances are preserved from the impact of human tissue. The second design is a full wavelength rectangular ring antenna. A quarter wavelength tuning stub is added closed to the feeding portion to reduces the influences of the human body. The antenna is with 250MHz bandwidth determined by VSWR2.0。The third design is use for the first antenna to extend as a 2 times 1 MIMO antenna then to discuss the isolation technology using in wrist device difference.
15
Frank, Peter M. "Integrating active devices to structures with aperture-coupled microstrip feeding." 1997. http://hdl.handle.net/1993/19432.
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16
Wu, Hung-Wei, and 吳宏偉. "Study of Thin Film Microstrip Line and Metamaterial on Microwave Passive Devices." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/99552310754202138481.
Повний текст джерелаАнотація:
博士國立成功大學
微電子工程研究所碩博士班
95
This dissertation divides into three parts: (a) Preparation of thin film microstrip line using low K dielectrics; (b) microwave measurements of the low K dielectric materials and (c) design of filter with metamaterial and with multi-band performance. (a) Preparation of thin film microstrip line using low K dielectrics In the first part of the dissertation, we propose a detailed fabricating process and characterization of thin film microstrip line (TFML) on low K polyimide. By incorporating a spin-on dielectric polyimide and sputtering of aluminum, the TFML is fabricated on low cost low resistivity silicon (LRS) substrate ( ), the TFML with a thickness of 20μm polyimide dielectric layer presents attenuation losses of 0.385 dB/mm at 25 GHz and 0.438 dB/mm at 50 GHz. Effective dielectric constants, loss tangent and average power handling capability (APHC) of TFML on polyimide are carefully investigated and discussed. Additionally, the microwave characteristics of the dc-biased TFML were studied. This characterization of the TFML can be extensively applied on the interconnection of radio frequency integrated circuit (RFIC). (b) Microwave measurements of the Low K dielectric materials In the second part of the dissertation, we present a novel finite ground microstrip line to develop and to measure the microwave properties of TFML. By using the high frequency on-wafer and transmission line measurement technique, the low K dielectric can be accurately determined in the microwave properties and APHC under the condition for without dc-bias and with dc-bias. Especially in the case with dc-bias that can effectively evaluate the possibility of RF SoC. (c) Filter design with metamaterial and with multi-band performance In the third part of the dissertation, we discuss the propagation characteristics of single complementary split-ring resonator (CSRR) in planar transmission media. We also applied the periodic CSRRs to suppress the harmonics of the conventional dual-mode ring bandpass filter (BPF) by using the propagation characteristics of the periodic CSRRs. Additionally, we present a dual-band filter using stepped impedance resonator (SIR). The BPF has good dual-passband performances at 2.4 / 5.2 GHz and high isolation between the two passbands. The dual-band BPF has a smaller area and lower insertion loss in comparison of previous works. Finally, some suggestions are made in the future work on technology for system on chip (SoC).
17
Nakar, Punit S. Gross Frank B. "Design of a compact microstrip patch antenna for use in wireless/cellular devices." 2004. http://etd.lib.fsu.edu/theses/available/etd-04102004-143656.
Повний текст джерелаАнотація:
Thesis (M.S.)--Florida State University, 2004.Advisor: Dr. Frank Gross, Florida State University, College of Engineering, Dept. of Electrical and Computer Engineering. Title and description from dissertation home page (viewed 6/15/04). Includes bibliographical references.
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"Study and fabrication of optically controlled microstrip single gap and interdigitated gap devices on silicon." Thesis, 2005. http://library.cuhk.edu.hk/record=b6074155.
Повний текст джерелаАнотація:
In the analysis of optically controlled microstrip interdigitated gaps, an equivalent circuit model for simple interdigitated gap is obtained. As far as we know, this is the first report of optically controlled microstrip interdigitated gap equivalent circuit model. The amplitude and phase changes of interdigitated gaps under different illumination powers are calculated with this equivalent circuit model, which basically agree with the experimental results. Meanwhile, the effect on the transmission characteristics from the gap dimensions is also discussed. Finally a novel gap structure is described for optically controlled phase shifter application, whose transmission characteristics have nearly zero amplitude change and no less than 27 degrees phase change under different illumination powers when the transmission signal frequency is about 1.8 to 2.5GHz. Some detailed experimental results of this gap are presented in Chapter 5.In this dissertation, a systematic work has been done to analyze the transmission characteristics and applications of optically controlled microstrip single gap and interdigitated gap devices on high resistivity silicon (HRS) wafer. Detailed simulations, experiments and the relative equivalent circuit models for these gap structures are presented.
Microwave photonics is a multi-disciplinary area that studies the interactions between microwave signals and optical signals. As one of the key elements, direct optical control of microwave semiconductor devices has been an area of growing interest since 1980's. They can be widely used in picosecond photoconductive switch, phase shifter, attenuator, high-speed sampling, gain control of amplifier and so on.
Some future work is also suggested based on the study in this dissertation.
Specifically, optically controlled microstrip discontinuities devices fabricated on semiconductor substrates have wide-ranging applications due to their simple fabrication, easy integration with other passive and active microwave devices.
When illuminated on the surface of the microstrip single gaps, the S 12 amplitude of this gap increases linearly as the optical illumination increasing, which is a good potential application for digital controllable attenuator. The change of the S12 amplitude is mainly due to the imaginary permittivity change of the HRS substrates. The equivalent circuit model is established to explain the amplitude and phase changed. The equivalent resistors have been calculated according to the excess carrier concentration profile after illumination, which match well with the experimental results.
Li Huiping.
"March 2005."
Adviser: K. T. Chan.
Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6619.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2005.
Includes bibliographical references.
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts in English and Chinese.
School code: 1307.
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HSU, Mao-Hsiu, and 徐茂修. "Applications of Annealing Algorithm on the Design of Optical Thin-Film Devices and Microstrip Multi-Band Filters." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/90224181603305772173.
Повний текст джерелаАнотація:
博士國立臺灣科技大學
電子工程系
93
This method shows the superiority of high effectiveness and global optimized solutions designing DWDM filters by using the idea of simulated annealing algorithm. The spectral transmittance and reflectance curves of these filters applying this method all effectively achieve their desired optical performances. Although the design procedure is concentrated on 1550 nm band, in general, this method can be applied to arbitrary optical bands. Then, we present a computer-aided circuit design procedure of simulated annealing algorithm to optimize multi-wideband microstrip line filters with symmetrical at least 500 MHz bandwidths respectively. This method demonstrates the superiority of designing microstrip line dual-band filters without previous circuit layout first and full wave simulations. The value of characteristic impedances and electrical lengths of transmission lines synthesizing 2.4 GHz and 5.2 GHz multi-band filters with a single input and a single output are adjusted to the annealing process by the optimization algorithm. For the fine multi-band circuit models, it is imperative that one wide-band band-pass (BP) filter is inserting into one narrow band band-stop (BS) filter or double behavior resonator (DBR) is the three band-stop responses with three transmission zeros or stepped impedance resonator (SIR) is controlling the second harmonic band to be the pass-band in the frequency domain. Therefore, the synthesized procedure is first operated two stubs in parallel with the opened or short circuit resonator and they are based on the wide BP & narrow BS and DBR theorems. Then, we develop a series of two or three stubs with the opened or short circuit resonator to be the SIR configurations. The merit functions almost converge to zero to calculate the second, third and fourth order filters respectively and approach the ideal filter curve and global optimized solutions. We also take the advantage of tuning the connected transmission line (TL) for the second order filter by optimized algorithm then we can get the matched and high quality factor (Hi-Q) design. The optimized algorithm, full wave simulation and fabricated of multi-band insertion, transmission and reflection loss of responses are almost the same. The method is applicable not only in 2.4 GHz and 5.2 GHz, but can be applied to any other multi-frequency bands. Finally, based on previously experiment results, we also analyze and present a novel method of designing microstrip line multi-frequencies band filters by applying the SIR technology. Based on these stated topologies and optimal algorithm results, we derived the general design and synthesized equations to get a very efficient theoretical response. Here, we proposed new some simplifications and general fundamental equations based on transmission poles and zeros to synthesize multi-passband and the four attenuated bands. Utilizing the S-parameter and the ABCD parameters of a two-port network is for the analysis of short-circuited and open-circuited resonators with various combinations of series and shunt sequences. The transmission zeros are determined where we consider the feeding positions and resonance frequency then by controlling the impedance ratio of the resonators, both center frequencies of the two passbands are determined. Therefore, we can choose the impedance magnitude to design the skirt performance, Q factor, and bandwidth of the filters. The separated distance of two center frequencies and limit maximum bandwidth for all of the resonators are discussed. Moreover, a global synthesis approach is also discussed on miniaturization. A simplified architecture based on bent SIR offers the 50% area reduction of layout. Technology of matching circuit creates higher performance multi-band filter. We adjust impedance and electrical length of TL to compensate multi-band and bending for matches and highly improve the insertion and reflection loss. Simulation and measurement are performed to validate our method and are pretty matched. It shows that these filters applying these methods all effectively achieved desired high performances, resulted in a lower cost of multi-band filters and opened the way to commercial mass productions.
20
Edwards, Nathaniel Scott. "⁶Li-based suspended foil microstrip neutron detectors." Diss., 2018. http://hdl.handle.net/2097/39131.
Повний текст джерелаАнотація:
Doctor of PhilosophyDepartment of Mechanical and Nuclear Engineering
Douglas S. McGregor
The low natural abundance and supply shortage of ³He has resulted in an increase in the cost of ³He. The increase in cost of ³He proportional counters has motived the development of low cost, high efficiency, low gamma-ray sensitivity alternative technologies. A recently developed alternative technology is the ⁶Li-based suspended foil microstrip neutron detector (SFMND) that combines the neutron-conversion and gamma-ray discrimination capabilities of ⁶Li foils with the mechanical robustness and electrical capabilities of microstrip electrodes. SFMNDs differ from Li-foil multi-wire proportional counters because the anode wires are replaced by a single microstrip electrode that improves the mechanical robustness, reduces the microphonic sensitivity, and allows for more ⁶Li foils to be incorporated within a smaller form factor. The first-ever SFMNDs containing one and five 96%-enriched, 75-µm thick ⁶Li foils were fabricated using a silicon microstrip electrode. Neutron-sensitivity testing was performed yielding measured intrinsic thermal-neutron detection efficiencies, εth, of 4.02 ± 0.04% and 14.58 ± 0.11%, respectively. High electrode capacitance and gain instability were exhibited by the silicon microstrip electrode during neutron-sensitivity testing that led to the search for an electrically-stable microstrip-electrode substrate. Schott Borofloat® 33 glass was identified as an electrically-stable substrate and microstrip electrodes were fabricated and characterized. The Schott Borofloat® 33 microstrip electrodes were electrically-stable for a minimum duration of time of approximately 23 hours and had capacitances over an order of magnitude less than the identically sized silicon microstrip electrodes. One- and five-foil SFMNDs were fabricated with a Schott Borofloat® 33 microstrip electrode. Using 96%-enriched, 75-µm thick ⁶Li foils, the one- and five-foil devices had maximum measured εth of 12.58 ± 0.15% and 29.75 ± 0.26%, respectively, with measured gamma-ray rejection ratios of 6.46 x 10⁻⁵ ± 4.32 x 10⁻⁷ and 7.96 x 10-5 ± 4.65 x 10-7 for a ¹³⁷Cs exposure rate of 50 mR hr⁻¹. Devices containing one, five, ten, and twenty 96%-enriched, 75-µm thick ⁶Li foils were simulated using MCNP6 and are theoretically capable of having εth of 18.36%, 54.08%, 65.43%, and 68.36%, respectively. The deviation between measured and simulated εth is suspected to occur due to the electric field strength distribution, electron attachment, microstrip-electrode capacitance, or any combination thereof and solutions for each of these suspected concerns are described.
21
Lin, Guan-Yu, and 林冠宇. "Study of Novel Multiband Monopole Microstrip Antenna for Portable Wireless Communications Device Application." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/16822031025782174568.
Повний текст джерелаАнотація:
碩士中華科技大學
飛機系統工程研究所
102
In this thesis, three novel multi-band monopole microstrip antennas can be used in portable wireless communications device are presented. The first one is a novel four inverted L-shaped monopole microstrip antenna, this antenna structure consists of three inverted L-shaped radiation patch, inverted L-shaped slit ground plane and a 50Ω microstrip line. Proposed antenna can generate a wide impedance bandwidth characteristic between the three inverted L-shaped. The measured operation band S11＜－10dB is 2.21GHz-9.57GHz, the peak gain of antenna is 1.72dBi, and can completely cover LTE 2.3GHz/2.6GHz、Bluetooth、WiMAX and WLAN 2.4GHz/5.2GHz/5.8GHz seven wireless communications bands. The second antenna is a novel shovel-like monopole microstrip antenna, the structure is composed of three parts, shovel-like radiation patch, inverted L-shaped slit ground plane and microstrip line respectively, inserted via-hole to the end of microstrip line, and by SMA connector is connected to the feed microstrip line. Proposed antenna can generate two wide impedance bandwidth characteristic between the shovel-like radiation patch and inverted L-shaped slit ground plane, The measured operation band S11＜－10dB are 823MHz-970MHz and 1.7GHz-2.88GHz respectively, the peak gain of antenna is 1.64dBi, and the impedance bandwidth can cover GSM 850/900、DCS、PCS、UMTS、LTE 2.3GHz/2.6GHz、Bluetooth and WLAN 2.4GHz nine operation bands. The last antenna is a novel planar inverted E-shaped slit monopole microstrip antenna, this antenna structure consists of inverted E-shaped slit radiation patch, inverted L-shaped slit ground plane and a 50Ω microstrip line. The measured operation bands are 820MHz-981MHz and 1.47GHz-2.51GHz respectively, the peak gain of antenna is 1.88dBi, and the impedance bandwidth can cover GSM 850/900、GPS、DCS、PCS、UMTS、LTE 2.3GHz、Bluetooth and WLAN 2.4GHz nine operation bands. According to the parameters of three novel multi-band monopole microstrip antennas are studied of optimizing structure. All presented antennas have the inverted L-shaped slit ground plane structure, which the structure consists of different high ground plane of the sides and ground plane middle of the slit, and have miniaturization, low cost, multi-band, low profile, simple structure, good impedance matching, consistent gain and stable radiation patterns characteristic.
22
Ye, Kai-Jia, and 葉愷珈. "Study of Novel Multiband Monopole tapered Microstrip Antenna for Wireless Communications Device Application." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/18865297143904580432.
Повний текст джерела
23
Teng, Hsien-Chiao, and 鄧先巧. "Study of the Organic Semiconductor Thin Film Embedded Active Device for Microstrip Patch Antenna." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/68398667059946072562.
Повний текст джерелаАнотація:
博士義守大學
電子工程學系博士班
99
In this dissertation, the technology of thermal evaporation has been utilized to grow the organic semiconductor thin film being functioned as active device and embedded into microstrip patch antenna. Meanwhile, for the microstrip patch antenna with embedded organic semiconductor thin film active device, the antenna gain can be justified without changing the operation frequency. By using of nematic liquid crystals (NLC) technology, we can detect the absorption electromagnetic energy band of p-type organic semiconductor thin film of NIQ to confirm that the microwave energy in radio frequency band would not be perturbed by NIQ organic thin film devices. Comparatively, not only the carrier drifting velocity is very slow in organic thin film and the references for the organic semiconductor thin film device embedded microstrip patch antenna are little, but also the P-N junction and channel current, building potential, energy states distribution, trap density and the channel impendence for the organic semiconductor thin film transistor are much more complicated than the inorganic ones. The study of the organic semiconductor thin film active device embedded to the microstrip is thus an interesting topic. The only choice for the flexible substrate for the applications in RFID antenna is organic semiconductor thin film device because of its conformational specialty. Organic thin film devices can be conformal to the tag with flexible configurations. We tried to use side probe fed to connect the organic thin film active device deposited upon the FR4 substrate to the microstrip patch antenna. Surprisingly, we could activate the organic thin film active device and microstrip patch antenna simultaneously at the same resonant frequency. The active device can directly justify the antenna gain and the patterns of far fields. Therefore, this kind of design can be used for RFID microstrip patch antenna without using external bias to activate the device. In theory, two problems are concerned. First is how to analyze and model an interface between the organic thin film and metal and the second is how to embed the I-V characteristic curve for the microstrip patch antenna. To solve the problem, we put forward the characteristics of solution, first, S11 value is used as equivalent circuitry for organic semiconductor field effect transistor and contact impendence for the interface between the thin film and metal, and then, other components in scattering matrix are used as the coupling to connect the leaky layer (thin film) presented by dielectric coefficient and loss tangent (substrate) as well as the I-V curve of the device. Practically, we successfully activate the device bias at 0.5 ~ 1.5 volt for diodes and transistors by properly probe fed through microstrip patch antenna. In conclusion, organic semiconductor thin film devices including diode and transistor used as the embedded active device can be applicative being embedded to the microstrip patch antenna. The organic semiconductor thin films including NIQ, Alq3, ZnBIP, CuPC and C60 were all discussed and applicative to the design of organic semiconductor thin film device as the parasitic components for the microstrip antenna. The experimental results revealed the major characteristics of junction currents along metal-organic material interface, ohm contact resistance between the electrodes of source and drain in organic semiconductor thin film transistor and the leaky effect of the organic semiconductor layers for the microstrip antenna. Further investigation about the advance topics including the full understanding of the energy levels and the surface charge transport at metal-organic material interface is well planned for future research.
24
YEH, CHING-FENG, and 葉青豐. "Automatic Precise Device-Level Placement and Fixed-Length Microstrip Routing for Millimeter-Wave RFICs." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/59405746705113584653.
Повний текст джерелаАнотація:
碩士國立中正大學
電機工程研究所
104
With advancing process technologies and booming IoT markets, millimeter-wave CMOS radio frequency integrated circuits (RFICs) have been widely developed in recent years. Since the performance of CMOS RFICs is very sensitive to the precision of the layout, precise placement of devices and precisely matched microstrip lengths to given values have been a labor-intensive and time-consuming task, and thus become a major bottleneck for time to market. This work introduces a novel holistic framework for concurrent device placement and microstrip routing of millimeter-wave RFICs. The resulting RFIC layouts excel in both performance and area compared with the simulation-tuning based manual layout, while the runtime is significantly reduced.