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Rozprawy doktorskie na temat „Antennas”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Rouibah, Ammar. "Un modèle analytique pour l'antenne microruban rectangulaire." Doctoral thesis, Universite Libre de Bruxelles, 2013. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209359.

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Les antennes microruban et en particulier l’antenne microruban rectangulaire sont étudiées et utilisées depuis plusieurs dizaines d’années.<p>Comme pour toute antenne, il est important de disposer pour ces antennes d’un modèle analytique qui permette une bonne compréhension du fonctionnement et fournisse de manière rapide des valeurs pour les principaux paramètres (fréquence de travail, impédance, gain, rendement et bande passante).<p>Au fil des ans, deux modèles, chacun comprenant de nombreuses variantes, ont été développés :le modèle dit « de la ligne de transmission » et le modèle dit « de

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2

Sonkki, M. (Marko). "Wideband and multi-element antennas for mobile applications." Doctoral thesis, Oulun yliopisto, 2013. http://urn.fi/urn:isbn:9789526201085.

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Abstract This dissertation presents wideband and multi-element antennas for mobile applications. It is divided into the following main parts: modal theory, wideband antennas, multi-element antennas, and wideband multi-element antennas. The radiating fields are first studied in terms of spherical scalar and vector modes, and it is shown how these modes correlate with the characteristic current modes on a planar mobile ground plane. The theory part shows how it is possible to excite the same modes on a conventional sphere and a rectangular planar mobile ground plane. The theory refers to the nov

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Nikolayev, Denys. "Miniature antennas for biomedical applications." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S149.

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La télémétrie biomédicale et l’interfaçage neuronal à base de dispositifs miniatures et autonomes sans fil constituent de nouvelles applications en émergence. Elles visent à répondre à de nombreux enjeux y compris dans les domaines de la santé, du sport et bien être, ou encore de la sécurité au travail et de la défense. Parmi les applications typiques de biotélémétrie, nous pouvons citer le monitoring de certains paramètres physiologiques : température corporelle, pression artérielle, rythme cardiaque, taux de glucose et d’anticorps, détection d’agents chimiques, etc. En ce qui concerne l’inte

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4

Trinh, Le-Huy. "Antennes reconfigurables pour les applications mobiles et réseaux sans fil." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4047/document.

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Au cours de ces dernières années, les technologies de télécommunication ont fait d'énormes progrès, notamment dans les communications mobiles et les réseaux de capteurs sans fil (WSN). Pour répondre à l’augmentation de la capacité de transmission et à l’amélioration de la qualité des canaux de communications mobiles, l’élargissement de la bande de fonctionnement est nécessaire par l'utilisation d'antennes reconfigurables en fréquence. En outre, dans les applications WSN, afin de réduire les collisions, d’augmenter la distance de communication et d'optimiser la consommation, l’utilisation d’ant

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5

Kabalan, Aladdin. "Miniaturisation et modélisation d’antennes monopoles larges bandes utilisant des matériaux magnéto-diélectriques en bande VHF." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S041/document.

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Les avions comportent plusieurs systèmes de navigation et de communication nécessitent des antennes VHF large bande. Réduire la taille de ses antennes est un enjeu majeur tout en gardant des bonnes performances. Cette thèse propose des nouvelles configurations d'antennes à profil bas utilisant des nouveaux matériaux nanocomposites non conducteurs constitués de nanoparticules magnétiques développés au Lab-STICC. Un monopole planaire large bande a été développé et optimisé avec un taux de miniaturisation de 60% grâce à l'utilisation d'un matériau magnéto-diélectrique de forte perméabilité et fai

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6

Shahpari, Morteza. "Fundamental Limitations of Small Antennas." Thesis, Griffith University, 2015. http://hdl.handle.net/10072/365747.

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The physical size and material properties of antennas are major limiting factors of the antennas performance. These limitations are usually manifested through parameters such as bandwidth, quality factor and efficiency. The presented research examines these fundamental limitations with specific focus on electrically small antennas, and a new bound for antenna efficiency is developed.<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>Griffith School of Engineering<br>Science, Environment, Engineering and Technology<br>Full Text

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7

Gorla, Hemachandra Reddy reddy. "MINIATUIRIZED ULTRA-WIDEBAND ANTENNAS FOR WIRELESS COMMUNICATIONS." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/dissertations/1905.

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Wireless communication is part of our daily life in several applications, such as cell phones, wireless printers, sensors, etc. Each wireless device requires at least one antenna to communicate with other devices. In 2002, Federal Communications Commission (FCC) assigned a frequency spectrum from 3.1 GHz to 10.6 GHz for ultra-wideband communications. Several narrowband antennas require to cover the entire range. Unlike narrowband antennas, ultra-wideband antennas need to cover the wide frequency band. This research mainly focuses on physically small antenna designs. The first antenna discu

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8

Sousa, Jonas Rodrigo da Silva. "Estudo de antenas para comunicação na faixa de subterahertz." Universidade Federal Rural do Semi-Árido, 2016. http://bdtd.ufersa.edu.br:80/tede/handle/tede/766.

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Submitted by Lara Oliveira (lara@ufersa.edu.br) on 2017-07-14T18:14:07Z No. of bitstreams: 1 JonasRSS_DISSERT.pdf: 2555775 bytes, checksum: 1cffc3792b8fe12b4067e7bc74ee127d (MD5)<br>Approved for entry into archive by Vanessa Christiane (referencia@ufersa.edu.br) on 2017-07-18T15:08:15Z (GMT) No. of bitstreams: 1 JonasRSS_DISSERT.pdf: 2555775 bytes, checksum: 1cffc3792b8fe12b4067e7bc74ee127d (MD5)<br>Approved for entry into archive by Vanessa Christiane (referencia@ufersa.edu.br) on 2017-07-18T15:11:33Z (GMT) No. of bitstreams: 1 JonasRSS_DISSERT.pdf: 2555775 bytes, checksum: 1cffc3792b8fe12b40

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9

Martinis, Mario. "Développement et caractérisation de métamatériaux pour application en cavité : application à la conception d'antennes compactes." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S107/document.

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Cette thèse présente de nouveaux développements pour de petites antennes en cavité. L'objectif principal de la thèse est l'analyse de la performance de la bande passante de ces antennes pour des tailles d'ouverture qui sont petites par rapport à la longueur d'onde en espace libre. Des cavités de formes rectangulaires et circulaires intégrées dans un plan de masse infini et dans des plans de masse de dimensions latérales finies sont examinées en détail. Jusqu'à présent, dans la littérature, le choix pour ces antennes en cavités portait sur des antennes imprimées microruban (patch). L'objet de l

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10

Li, Hui. "Decoupling and Evaluation of Multiple Antenna Systems in Compact MIMO Terminals." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96239.

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Research on multiple antenna systems has been a hot topic in recent years due to the demands for higher transmission rate and more reliable link in rich scattering environment in wireless communications. Using multiple antennas at both the transmitter side and the receiver side increases the channel capacity without additional frequency spectrum and transmitted power. However, due to the limited space at the size-limited terminal devices, the most critical problem in designing multiple antennas is the severe mutual coupling among them. The aim of this thesis is to provide compact, decoupled an

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11

Chiu, Chi Yuk. "Impedance bandwidth broadening techniques for small patch antennas /." access full-text access abstract and table of contents, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b19887796a.pdf.

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Thesis (Ph.D.)--City University of Hong Kong, 2005.<br>"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy" Includes bibliographical references (leaves 152-162)

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12

Duran, Venegas Juan Antonio. "Reconfigurable Metasurfaces for Beam Scanning Planar Antennas." Thesis, Toulouse, INPT, 2016. http://www.theses.fr/2016INPT0102.

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Nous étudions la mise en oeuvre d ‘antenne à balayage électronique dédiés aux applications de communications par satellite géostationnaire. Les structures développées sont adaptées pour être embarquées dans un avion ou un train. L'architecture de l'antenne développée est constituée d’un double réseau linéaire dans deux dimmensions transverses. Le balayage dans chaque réseau linéaire est assuré par des lignes coplanaires à métamateriaux contrôlées par varactor. Nous porposons de nouvelles méthodes de caracterisation des discontinuités en ligne coplanaire pour la conception de la ligne. De plus,

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13

Jaeck, Vincent. "Développement d’antennes de communication reconfigurables en bande C pour munitions intelligentes." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S104/document.

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De nos jours, les communications sans fil sont devenues un moyen incontournable et universel d'échange d'un large éventail d'informations entre différents systèmes, certains d'entre eux étant en mouvement comme des drones parmi tant d'autres. Dans le contexte de cette thèse nous considérons une liaison entre un projectile et une station de base. La géométrie de la structure ainsi que les contraintes aérodynamiques d'un tir balistique impliquent l'utilisation d'antennes patchs dans la partie conique à l'avant du projectile. Ce type d'antenne est facile à intégrer à une plate-forme en tant que r

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14

Weeratumanoon, Eakasit. "Helical Antennas with Truncated Spherical Geometry." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31193.

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A new variation of the spherical helical antenna made of a wire wound over a hemispherical surface and backed by a conducting ground plane is introduced. A constant spacing is maintained between the turns of winding. The geometry of this antenna is fully described by the number of turns and the radius of hemispherical surface. In addition to the hemispherical geometry, truncated double spherical helices are also examined. Radiation properties of the proposed antennas are studied both theoretically and experimentally. The wire antenna code ESP (electromagnetic surface patch), which is based

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15

Scattone, Francesco. "Phased array antenna with significant reduction of active controls." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S168/document.

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L'objectif de cette thèse est d'exploiter les phénomènes des ondes de fuite pour améliorer les performances des antennes classiques à ouverture pour les applications spatiales. Ici, nous considérons des configurations planaires où les ondes de fuite sont excitées entre un plan de masse et un superstrat partiellement réfléchissant. Des réseaux de petites ouvertures sur le plan de masse sont utilisés pour alimenter les antennes considérées. Les structures avec superstrat sont développées en configuration réseaux simples ou réseaux à commande de phase, considérées intéressantes en termes de flexi

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16

Perotoni, Marcelo Bender. "Projeto e desenvolvimento de lentes discretas." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-25072005-081712/.

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O presente trabalho trata do estudo, projeto, desenvolvimento, construção e medida de lentes discretas planares (DLAs). Estes dispositivos atuam como sistemas irradiantes, especialmente com características multi-feixes. A construção destas lentes utiliza tecnologias compatíveis com a fabricação de circuitos impressos, com alguns detalhes que são característicos da área de antenas e circuitos planares. O estudo aborda as equações de projeto e considerações gerais relativas ao atendimento de especificações técnicas preliminares. Foram desenvolvidas duas lentes discretas, uma na frequência de 8GH

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17

Hwang, Seung-Hyeon. "Adaptive antenna techniques for smart antennas and radar systems." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2005. http://wwwlib.umi.com/cr/syr/main.

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18

Alsawaha, Hamad Waled. "New Designs for Wideband Hemispherical Helical Antennas." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/34285.

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A unique property of spherical and hemispherical helical antennas is that they provide very broad half-power beamwdiths and circular polarization over a narrow bandwidth. In this thesis, new designs for hemispherical helical antennas are introduced that provide significant improvement in bandwidth, while maintaining the directivity and half-power beamwidth of the basic design. In the basic design, a simple wire of circular cross section is wound on the surface of a hemisphere, whereas in the proposed new designs a metallic strip forms the radiating element. Furthermore, the metallic strip may

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19

Öjefors, Erik. "Integrated Antennas : Monolithic and Hybrid Approaches." Doctoral thesis, Uppsala University, Department of Engineering Sciences, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7142.

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<p>This thesis considers integration of antennas and active electronics manufactured on the same substrate. The main topic is on-chip antennas for commercial silicon processes, but hybrid integration using printed circuit board technology is also addressed.</p><p>The possible use of micromachining techniques as a means of reducing substrate losses of antennas manufactured on low resistivity silicon wafers is investigated. Compact dipole, loop, and inverted-F antennas for the 20-40 GHz frequency range are designed, implemented, and characterized. The results show significantly improved antenna

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20

Ribeiro, Daniel Luiz. "Utilização de antena fractal de microfita em projetos de estruturas eletricamente pequenas e independentes da frequência." Universidade Federal de Uberlândia, 2016. https://repositorio.ufu.br/handle/123456789/17937.

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Antenas fractais são estruturas irradiadoras geradas recursivamente a partir da aplicação reiterada de um fator de conjunto gerador, possuindo a característica marcante de ser auto semelhante. São baseadas na teoria dos fractais desenvolvida por Mandelbrot e cuja aplicação se encontra presente em quase todos os ramos da ciência. Tais antenas possuem hoje inúmeras aplicações, de celulares a antenas de satélites, e têm se mostrado uma alternativa atraente para aplicações que requeiram característica de multibanda associada a alto ganho e miniaturização. O presente trabalho procura apresentar de

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21

Li, Pei. "Novel wideband dual-frequency L-probe fed patch antenna and array /." access abstract and table of contents access full-text, 2006. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b21471447a.pdf.

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Thesis (Ph.D.)--City University of Hong Kong, 2006.<br>"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy" Includes bibliographical references (leaves 179-189)

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Freitas, Renata Valerio de. "Análise de antenas no domínio do tempo." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-19112012-114901/.

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As recentes aplicações que utilizam bandas ultralargas e comunicação pulsada necessitam de antenas adaptadas às suas necessidades. Para tanto, é necessário entender melhor o funcionamento dessas antenas em toda a banda utilizada e sua resposta aos pulsos de entrada. Nesse sentido, algumas ferramentas de análise de antenas no domínio do tempo foram desenvolvidas e utilizadas de modo a explicar o mecanismo de radiação de algumas antenas. Através da utilização de estruturas grandes com relação à duração do pulso de entrada, é possível identificar como o pulso se propaga e é refletido pela estrut

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23

Hildebrand, Louis Trichardt. "The analysis of microstrip wire-grid antenna arrays." Pretoria : [s.n.], 2010. http://upetd.up.ac.za/thesis/available/etd-01272010-130234/.

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Ong, Chin Siang. "Digital phased array architectures for radar and communications based on off-the-shelf wireless technologies." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FOng.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 2004.<br>Thesis advisor(s): David C. Jenn, Siew Yam Yeo. Includes bibliographical references (p. 63-64). Also available online.

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25

Sundaram, Ananth Ramadoss Ramesh. "Electronically Steerable Antenna Array using PCB-based MEMS Phase Shifters." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/SUNDARAM_ANANTH_51.pdf.

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Davids, Vernon Pete. "Implementation of a wideband microstrip phased array antenna for X-band radar applications." Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/1100.

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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2009<br>This thesis presents the design, analysis and implementation of an eight-element phased array antenna for wideband X-band applications. The microstrip phased array antenna is designed using eight quasi-Yagi antennas in a linear configuration and is printed on RT/Duroid 6010LM substrate made by Rogers Corporation. The feeding network entails a uniform beamforming network as well as a non-uniform -25 dB Dolph-Tschebyscheff beamforming network, each with and without 45° delay lines, generating a squinte

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27

Jaafar, Hussein. "Antennes miniatures, large bande et superdirectives à charges optimisées par l'analyse des modes caractéristiques." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S031/document.

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L'évolution rapide dans les systèmes de communication sans fil nécessite plus de miniaturisation de divers composants électroniques en plus de l'élément majeur de la technologie sans fil : l'antenne. Dans ce cas, une antenne occupant un espace limité devrait être miniaturisée pour fonctionner aux bandes de communication souhaitées. Cependant, à mesure que la taille électrique de l'antenne diminue, ses performances se dégradent considérablement et sa bande passante, son efficacité et sa directivité sont limitées. Les techniques classiques de réduction de la taille avec chargement de matériau et

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Aqbi, Sadiq. "Improving the Performance of Dual Linear Polarization Antennas with Metamaterial Structures." Doctoral thesis, Universitätsbibliothek Chemnitz, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-233539.

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In this dissertation, the operation of dual-linear polarized antennas is considered in order to provide ideal performance suited for several applications including polarimetric synthetic aperture radar (SAR), wireless and satellite communications. The underlying objectives realized in this work are reported as design realizations of dual-linear polarized antennas with low cross polarization patterns and high isolation between ports that employ special properties of the electromagnetic metamaterial (MTM) structures. Some of these key properties appear as negative permittivity, negative permeabi

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Dakhli, Saber. "Augmentation de la performance des antennes miniatures inspirées par métamatériaux : conception d'antennes, inspirée par métamatériaux." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S029/document.

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Le travail de cette thèse concerne la conception de nouvelles architectures d'antennes miniatures ou multifréquences en utilisant la technique inspirée des métamatériaux. Les antennes proposées sont munies de nouvelles formes d'éléments parasites qui permettent d'obtenir des structures compactes et donc facilement intégrables dans les terminaux mobiles. Par la suite, l'étude et la conception d'antennes directives et reconfigurables en diagramme de rayonnement par la technique inspirée des métamatériaux a été menée. En première partie, une étude paramétrique sur les paramètres pertinents de la

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Lai, Hau Wah. "Wideband meandering probe-fed patch antenna /." access full-text access abstract and table of contents, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b19887383a.pdf.

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Thesis (Ph. D.)--City University of Hong Kong, 2005.<br>"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves 144-153).

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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.

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Sethi, Waleed Tariq. "Optical antennas for harvesting solar radiation energy." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S129/document.

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Au cours des dernières années, la communauté scientifique s'est intéressée de plus en plus à l'acquisition de sources d'énergie renouvelables vertes et propres par rapport aux combustibles fossiles traditionnels. Le rayonnement solaire est une source particulièrement abondante d'énergie renouvelable qui a été largement utilisée dans les véhicules, les machines et les bâtiments, entre autres. Il y a généralement deux manières différentes d'utiliser l'énergie solaire: la chaleur et l'électricité. La principale motivation de ce travail de thèse est d'utiliser cette abondante source d'énergie pour

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Jusoh, Tajudin Mohd Taufik. "Study and design of reconfigurable antennas using plasma medium." Phd thesis, Université Rennes 1, 2014. http://tel.archives-ouvertes.fr/tel-01060295.

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Plasma is the 4th state of matter with complex permittivity that can be exploited to give advantages in communication system. Its negative permittivity has been studied in many research papers and it was proven to have similar characteristics as metal material in terms of electrical conductivity. While keeping permeability in the positive region, plasma will respond to electromagnetic waves in the similar manner as metal. Therefore, this thesis aimed to use plasma as an alternative to metal in the construction of reconfigurable antennas. The first part of this thesis is dedicated to characteri

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Barro, Oumar Alassane. "Design and manufacturing reconfigurable antennas using plasma." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S068/document.

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Le plasma est le quatrième état de la matière avec une permittivité complexe qui peut être exploitée pour donner des avantages aux systèmes de communications. Entre autres, une permittivité négative lui permet d'avoir des caractéristiques similaires aux matériaux métalliques en termes de conductivité électrique. Depuis de nombreuses années, les antennes plasma ont été étudiées en raison de leur capacité à être conductrices ou transparentes vis-à-vis des ondes électromagnétiques. Le principal avantage de l'utilisation d'antennes à base de plasma au lieu d'éléments métalliques est qu'elles perme

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Zhang, Tieren, University of Western Sydney, of Science Technology and Environment College, and School of Engineering and Industrial Design. "Applications of microwave holography to the assessment of antennas and antenna arrays." THESIS_CSTE_EID_Zhang_T.xml, 2001. http://handle.uws.edu.au:8081/1959.7/770.

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Gabor's original holography, which is the basic theory of modern microwave holographic techniques, is introduced. By computer simulations, it is demonstrated that the conventional holographic approach can be used as a tool to reconstruct aperture field distributions of an antenna with some constraints. Computer simulations of the theory and technique of the improved microwave holographic approach originally introduced by Rahmat-Samii et al. are carried out. The results show that it can be used for surface distortion diagnosis of large reflector antennas. The physical optics integral formulatio

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36

Revankar, U. K. "Three-Layer Electromagnetically Coupled Circular Microstrip Antennas." Thesis, Indian Institute of Science, 1995. https://etd.iisc.ac.in/handle/2005/241.

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Presented in this thesis are the following experimental and theoretical investigations carried out on the three-layer electromagnetically coupled (EMC) circular microstrip antennas and their arrays. 1.Three-Layer EMC Circular Microstrip Antenna A three-layer EMC circular microstrip antenna consists of a probe-fed circular microstrip patch having two parasitically excited circular microstrip patches (without ground planes) stacked above it, with air gaps in between successive substrates. In the "inverted" configuration, the parasitic patches are on the lower (nearer to the driven substrat

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Revankar, U. K. "Three-Layer Electromagnetically Coupled Circular Microstrip Antennas." Thesis, Indian Institute of Science, 1995. http://hdl.handle.net/2005/241.

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Presented in this thesis are the following experimental and theoretical investigations carried out on the three-layer electromagnetically coupled (EMC) circular microstrip antennas and their arrays. 1.Three-Layer EMC Circular Microstrip Antenna A three-layer EMC circular microstrip antenna consists of a probe-fed circular microstrip patch having two parasitically excited circular microstrip patches (without ground planes) stacked above it, with air gaps in between successive substrates. In the "inverted" configuration, the parasitic patches are on the lower (nearer to the driven substrate) s

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38

Hamouda, Hafedh. "Conception d'antennes miniatures intégrées à leur support pour applications en télémédecine mobile." Thesis, Nice, 2014. http://www.theses.fr/2014NICE4062.

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La télémédecine et plus particulièrement la télémédecine mobile semble représenter l’avenir en termes de soins médicaux. Ce concept nécessite cependant pour sa viabilité, de disposer d’éléments rayonnants miniatures, fortement efficaces, et capables de communiquer sur plusieurs bandes. Ce mémoire présente la méthodologie de conception et l’optimisation d’antennes miniatures intégrées, dédiées à un dispositif spécifique permettant de réaliser une liaison radiofréquence entre un implant médical et le téléphone portable d’un patient. Cependant, la miniaturisation des antennes, éléments clés de ce

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Schlub, Robert Walter, and n/a. "Practical Realization of Switched and Adaptive Parasitic Monopole Radiating Structures." Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040610.112148.

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Switched and adaptive parasitic monopole array radiating structures are investigated. Antenna design is orientated toward increasing practicability for implementation in terrestrial wireless communication systems. A number of antennas are designed with the aid of optimization and commercial simulation software. Simulation procedure was verified with the experimental manufacture and measurement of the arrays. The antennas presented in this thesis comprise an active monopole surrounded by a ring of parasitic monopoles. Parasitic radiators are constructed with static loading to enable simple expe

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Schlub, Robert Walter. "Practical Realization of Switched and Adaptive Parasitic Monopole Radiating Structures." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/366803.

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Switched and adaptive parasitic monopole array radiating structures are investigated. Antenna design is orientated toward increasing practicability for implementation in terrestrial wireless communication systems. A number of antennas are designed with the aid of optimization and commercial simulation software. Simulation procedure was verified with the experimental manufacture and measurement of the arrays. The antennas presented in this thesis comprise an active monopole surrounded by a ring of parasitic monopoles. Parasitic radiators are constructed with static loading to enable simple expe

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41

McFadden, Michael. "Analysis of the equiangular spiral antenna." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31726.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Scott, Waymond; Committee Member: Eslinger, Owen; Committee Member: Ingram, Mary; Committee Member: Peterson, Andrew; Committee Member: Smith, Glenn. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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42

Mayhew-Ridgers, Gordon. "Development and modelling of new wideband microstrip patch antennas with capacitive feed probes." Thesis, Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-09162004-083016.

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Moretti, Angelo. "Estudo do brim Santista visando aplicações em antenas têxteis." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259178.

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Orientador: Hugo Enrique Hernández Figueroa<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-18T02:42:50Z (GMT). No. of bitstreams: 1 Moretti_Angelo_M.pdf: 24209106 bytes, checksum: 508d580f17f75e3268a4804a1f255b60 (MD5) Previous issue date: 2011<br>Resumo: A caracterização eletromagnética do tecido brim Santista, através de medições experimentais e cálculos analíticos da constante dielétrica e tangente de perda desse material foi apresentada de forma pioneira. Para esse propósito foi implem

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Leonard, Cathy Wood. "Optical feeds for phased array antennas." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/80079.

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This thesis investigates optical feed methods for phased array antennas. The technical and practical limitations are analyzed and an optimum design is determined. This optimum optical feed is a two-beam interferometric approach which uses acoustooptic phase control. The theory is derived; a computer model is developed; and the limitations are determined. Design modifications are suggested which reduce limitations and greatly extend the range of applications.<br>Master of Science

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45

Aguilà, Moliner Pau. "Estudio de las propiedades de radiación de partículas resonantes con aplicaciones en sistemas de comunicaciones." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/402268.

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El sector de las radiocomunicaciones ha experimentado un drástico desarrollo estos últimos años. Entre ellos, los sistemas de comunicaciones inalámbricos han sufrido un gran crecimiento en la sociedad moderna motivado por el elevado número de servicios en que se pueden aplicar (por ejemplo radiodifusión, telefonía móvil, posicionamiento por satélite o bien identificación por radiofrecuencia). Esto ha motivado la investigación de nuevos dispositivos de microondas con diferentes y mejores prestaciones. La tendencia más extendida actualmente consiste en utilizar tecnologías planares para la reali

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Tursunniyaz, Muhammadeziz. "Conformal Inkjet Printed Antennas for Small Spacecraft." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7161.

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Although small spacecraft are small in size and light in weight compared to the conventional satellites, they can offer lots of possibilities for space exploration, scientific observation, data collection and telecommunication. Also, they cost a lot less money than the conventional satellites, and the scientific missions can be planned in a relatively short period of time by using the COTS (Commercial Off-The-Shelf) materials. However, there is a big challenge for the small spacecraft that is the limited surface area of the small spacecraft and the outnumbered components to be mounted on the s

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Mohammadzadeh, Galehdar Amir. "The Space Filling Meander Antennas for RFID Applications." Thesis, Griffith University, 2009. http://hdl.handle.net/10072/366547.

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A novel wire meander antenna is introduced for Radio Frequency Identification applications. The aim of this research was to find design rules rather than finding the best performing antenna. The limitations to small antennas performance are explored and reviewed to establish a guideline for new designs. Radiation efficiency was chosen as performance factor for measuring antenna quality. A method of moments technique based on the summation of segment currents and segment loss is introduced for finding the efficiency of wire antennas in free air. It compared favourably with two different results

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Puente, Baliarda Carles. "Fractal antennas." Doctoral thesis, Universitat Politècnica de Catalunya, 1997. http://hdl.handle.net/10803/398784.

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Las antenas son dispositivos esencialmente de banda estrecha; es decir, su comportamiento es altamente dependiente de la frecuencia de operación. La relación entre la longitud de onda de trabajo y el tamaño de la antena condiciona enormemente sus prestaciones. Ello implica que es complicado realizar antenas que funcionen de la misma forma en varias frecuencias, o que tengan un tamaño mucho menor que la longitud de onda. En esta tesis se introduce el diseño fractal de antenas como una posible alternativa para abordar este tipo de problemas. En particular, se muestra como las propiedades geomét

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Kvapil, Michal. "Plasmonic Antennas." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234590.

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Tato disertační práce pojednává o plazmonických anténách. Rezonanční vlastnosti plazmonických antén jsou studovány teoreticky i experimentálně. Teoretické výpočty jsou prováděny v programu Lumerical FDTD Solutions užitím numerické metody konečných diferencí v časové doméně. Pro experimentální studium byly antény vyrobeny pomocí elektronové litografie. Rezonanční vlastnosti vyrobených antén jsou studovány fourierovskou infračervenou spektroskopií. Práce se zaměřuje na studium rezonančních vlastností antén vyrobených na vrstvě nanokrystalického diamantu. Dále zkoumá možnost využití antén jako pl

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Elghannai, Ezdeen Ahmed. "NOVEL METHOD TO CONTROL ANTENNA CURRENTS BASED ON THEORY OF CHARACTERISTIC MODES." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471871173.

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