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Dissertations / Theses on the topic 'Antenna Array Element'

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Published: 4 June 2025

Last updated: 15 July 2025

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1

Samuelsson, Jacob. "Phased array antenna element evaluation." Thesis, Linköpings universitet, Fysik och elektroteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-141690.

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This thesis evaluates two array antenna elements for large phased array antennas. The two antenna concepts are a surface mounted notch element and a PIFA (Planar Inverted F Antenna). The antennas have been simulated at S-band in Ansys HFSS as a unit cell in an infinite array environment. Thereafter, a finite 7 x 7 element array of the two concepts was simulated. A corresponding 49 element array, using the notch element, was built and measured upon. Embedded element patterns and S-matrix parameters have been measured. From this result, full array antenna patterns as well as active reflection co

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2

Takamizawa, Koichiro. "Array antenna synthesis including element and feed coupling." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/76146.

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Precise radiation pattern control for an array antenna requires precise control of array element excitations. One application is that of low side lobe patterns. Classical synthesis methods for the desired pattern may not be realized in practice due to coupling effects. Coupling occurs in two forms: the mutual coupling between array elements and the coupling introduced by the feed networks. Ideally one could account for such coupling within the array architecture during the design process and alter the feed network parameters to adjust for such coupling. Unfortunately, this is a nonlinear probl

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3

Ip, Kenneth Ho Yan. "A compact four-element injection-locked scanning antenna array." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63018.pdf.

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4

Buxton, Carey G. "Design of a Broadband Array Using the Foursquare Radiating Element." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28363.

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Broadband scanning arrays require small element spacing over a broad frequency band to achieve the desired scan capabilities. Previous research has concentrated on the development of small broadband elements to meet the demands of broadband arrays. However, mutual coupling between elements in a tightly spaced array can change the operating frequency and bandwidth from that of the single isolated element. Several research efforts have focused on minimizing the mutual coupling to maintain the frequency response of the single isolated element. This dissertation focuses on using the strong coup

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5

Rundquist, Victor Frederic. "Weak signal reception using software defined radios and a two-element antenna array." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/RUNDQUIST_VICTOR_6.pdf.

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6

Emrick, Rudy M. "On-chip antenna element and array design for short range millimeter-wave communications." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1195741138.

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7

Emrick, Rudy Michael. "On-chip antenna element and array design for short range millimeter-wave communications." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1195741138.

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8

Evans, Daniel N. "Near-Optimal Antenna Design for Multiple Antenna Systems." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd2796.pdf.

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9

Potgieter, Brendon Ryan. "Experimental modal analysis and model validation of antenna structures." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5423.

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Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Numerical design optimisation is a powerful tool that can be used by engi- neers during any stage of the design process. Structural design optimisation is a specialised usage of numerical design optimisation that has been adapted to cater speci cally for structural design problems. A speci c application of structural design optimisation that will be discussed in the following report is experimental data matching. Data obtained from tests on a physical structure will be matched

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10

Esswein, Lance C. "Genetic algorithm design and testing of a random element 3-D 2.4 GHZ phased array transmit antenna constructed of commercial RF microchips." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FEsswein.pdf.

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Thesis (M.S. in Physics)--Naval Postgraduate School, June 2003.<br>Thesis advisor(s): Michael Melich, David Jenn, Rodney Johnson. Includes bibliographical references (p. 113-115). Also available online.

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11

Abdelhafeid, Faraj. "The Effect Upon Antenna Arrays of Variations of Element Orientation and Spacing in the Presence of Channel Noise, with an Application to Direction Finding." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1525866099535246.

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12

Dorsey, William Mark. "Low Profile, Printed Circuit, Dual-Band, Dual-Polarized Antenna Elements and Arrays." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/26683.

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Dual-band antenna elements that support dual-polarization provide ideal performance for applications including space-based platforms, multifunction radar, wireless communications, and personal electronic devices. In many communications and radar applications, a dual-band, dual-polarization antenna array becomes a requirement in order to produce an electronically steerable, directional beam capable of supporting multiple functions. The multiple polarizations and frequency bands allow the array to generate multiple simultaneous beams to support true multifunction radar. Many of the applications

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13

Vines, Roger. "MISSILE ANTENNA PATTERNS FOR WIDELY-SPACED MULTI-ELEMENT ARRAYS." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/605040.

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ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Multiple discrete antennas distributed around the circumference of a large missile and driven by one transmitter are sometimes used to radiate telemetry omnidirectionally. But driving discrete antennas separated by several wavelengths around the missile body with a single transmitter can result in an antenna pattern with deep nulls in the roll plane. Varying the relative signal phase or amplit

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14

Tzanidis, Ioannis. "Ultrawideband Low-Profile Arrays of Tightly Coupled Antenna Elements: Excitation, Termination and Feeding Methods." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316439948.

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15

Dyberg, Karin, and Linda Farman. "Spatial TDMA in Ad Hoc Networks with Antenna Arrays." Thesis, Linköping University, Department of Science and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1104.

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<p>In modern military operations the requirements of transmitting large amounts of information have increased substantially during the last decade. This increases the demand for high-capacity radio networks. It is also very important that military decisions are made on recent and correct information and this implies that low and known delays are required. The existing military radio ommunications, within the Swedish army, do not meet the requirements for capacity and delay. </p><p>We have investigated how the capacity and average delay can be improved in an Ad Hoc network with STDMA by using a

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16

Irci, Erdinc. "Low-Profile Wideband Antennas Based on Tightly Coupled Dipole and Patch Elements." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316456337.

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17

Oueslati, Aymen. "Nouveau concept simplifié d’antennes reconfigurables utilisant les couplages interéléments : Mise en œuvre d’un réseau hybride." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0136/document.

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Les travaux de cette thèse s’intéressent à un nouveau concept d’antenne reconfigurable offrant un bon compromis entre performances, complexité et coût. Ce concept, qualifié d’hybride, vise à combiner les avantages des réseaux d’antennes lacunaires et des antennes à éléments parasites. Cette hybridation est une alternative à la complexité des réseaux d’antennes conventionnels pour répondre aux exigences d’une architecture modulaire, générique et reconfigurable. L’intérêt majeur de ce concept est de proposer une architecture d’antenne permettant de réduire la complexité du circuit de formation d

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18

Bernard, Bruno. "Interactions acoustiques entre transducteurs de type flextenseur." Valenciennes, 1994. https://ged.uphf.fr/nuxeo/site/esupversions/da2ea5d9-88a0-4560-85ad-315bde81f554.

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En acoustique sous-marine, il existe actuellement un intérêt grandissant pour les systèmes sonar actifs basse fréquence, destinés à la détection longue portée de sous-marins discrets. Pour ces sonars, les réseaux compacts de flextenseurs constituent un système d'émission intéressant, car ils délivrent une forte puissance acoustique en basse fréquence. Malheureusement, il se manifeste dans ces réseaux des interactions acoustiques fortes difficiles à modéliser, ce qui constitue un obstacle majeur à la conception d'antennes de flextenseurs. C'est pourquoi la recherche présentée propose une méthod

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19

Rieger, James L. "Telemetry Antenna Patterns for Single and Multi-Element Arrays." International Foundation for Telemetering, 1990. http://hdl.handle.net/10150/613429.

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International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>The use of multiple antennas (or multiport) antennas for vehicular telemetry causes patterns to result which are unknown and not well understood by the telemetry designer. When the antenna ports are separated by distances of more than a half wavelength, the resulting patterns are rarely what was intended. The antenna plotting program, an extension of a earlier University of Utah antenna plotting routine, allows rapid creation of patterns for up to 30 (or

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20

McCann, John Forrest. "On the design of large bandwidth arrays of slot elements with wide scan angle capabilities." Connect to resource, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1209590321.

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21

McColl, Iain. "Radiating and coupling elements in waveguide planar array antennas." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/788.

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22

Henry, B. "Investigation of rectangular dielectric resonator antenna elements and arrays." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/MQ44845.pdf.

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23

Wallace, Matthew J. "Mutual Elements and Substrate Effect Analysis on Patch Antenna Arrays." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3702.

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There have been many different technology advancements with the invention of solid state electronics, leading to the digital era which has changed the way users employ electronic circuits. Antennas are no different; however, they are still analog devices. With the advancements in technology, antennas are being fabricated on much higher frequencies and with greater bandwidths, all while trying to keep size and weight to a minimum. Centimeter and millimeter wave technologies have evolved for many different radio frequency (RF) applications. Microstrip patch antennas have been developed, as wire

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24

Almeida, Filho Valdez Arag?o de. "Arranjos Log-Peri?dicos Compactos em Microfita com Elementos Fractais de Koch." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15315.

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Made available in DSpace on 2014-12-17T14:55:43Z (GMT). No. of bitstreams: 1 ValdezAAFi_DISSERT.pdf: 1620850 bytes, checksum: c1208b8ca13742d0d9cd3ac88c864f60 (MD5) Previous issue date: 2010-06-14<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>This work aims to present how the application of fractal geometry to the elements of a log-periodic array can become a good alternative when one wants to reduce the size of the array. Two types of log-periodic arrays were proposed: one with fed by microstrip line and other fed by electromagnetic coupling. To the elements of these arr

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25

Smith, Brady Christopher. "MSM photodiode as the switching element in a photoswitch-based class E microwave power amplifier." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5672.

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Thesis (M.S.)--University of Missouri-Columbia, 2008.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 14, 2009) Includes bibliographical references.

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26

Caswell, Eric D. "Design and Analysis of Star Spiral with Application to Wideband Arrays with Variable Element Sizes." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/25963.

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This dissertation details the development of the star spiral antenna and demonstrates the advantages of the star spiral when used in a wideband array with variable element sizes. The wideband array with variable element sizes (WAVES) is a multi-octave array that uses different sized circular Archimedean spirals for each octave of frequency coverage. A two-octave WAVES array has been presented in the literature, but a gap in the two-octave frequency coverage exists along the principal axes. The star spiral antenna was developed to eliminate the performance gap in the WAVES array. The star sp

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27

Scott, H. M. "Near field modification techniques for pattern shaping in antenna elements and arrays." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269176.

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28

Quist, Britton T. "Synthesis of Optimal Arrays For MIMO and Diversity Systems." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/1244.

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This thesis proposes a method for determining the optimal antenna element radiation characteristics which maximize diversity gain given a specific power angular spectrum of the propagation environment. The method numerically constructs the eigenfunctions of the covariance operator for the scenario subject to constraints on the power radiated by each antenna as well as the level of supergain allowed in the solution. The optimal antenna characteristics are produced in terms of radiating current distributions along with their resulting radiation patterns. The results reveal that the optimal anten

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29

Alzein, Hala. "Développements de nouvelles architectures d’antennes reconfigurables pour les applications de télécommunications de 5ème génération." Thesis, Limoges, 2020. http://www.theses.fr/2020LIMO0014.

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L’évolution rapide des communications sans fil et reconfigurables demande des systèmes antennaires avancés qui sont capables de satisfaire des besoins en termes d’agilité des diagrammes, un fort gain et un fonctionnement large bande. Afin de répondre à ces nouveaux besoins, la solution proposée dans cette thèse est basée sur l’ARFFR proposée par le laboratoire XLIM pour obtenir un compromis très intéressant en termes de performances / consommation énergétique / coût. Ces travaux ont notamment été utilisés dans le cadre d’une thèse (2012-2015) pour démontrer la faisabilité sur un premier démons

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30

Ozkaya, Guney. "The Effects Of Mutual Coupling Between Antenna Elements On The Performance Of Adaptive Arrays." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/2/1093079/index.pdf.

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Array processing involves manipulation of signals induced on various antenna elements. In an adaptive array system, the radiation pattern is formed according to the signal environment by using signal processing techniques. Adaptive arrays improve the capacity of mobile communication systems by placing nulls in the direction of interfering sources and by directing independent beams toward various users. Adaptive beamforming algorithms process signals induced on each array element that are assumed not to be affected by mutual coupling between the elements. The aim of this thesis is to investigat

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31

Molony, Anna. "The application of fibre Bragg grating networks as strain sensors and as phased array antenna true time delay elements." Thesis, Aston University, 1996. http://publications.aston.ac.uk/15355/.

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The fabrication of in-fibre Bragg gratings, and the application of arrays of such gratings as strain sensors and as true time delay elements for the control of phased array antennas is reported. Chirped period Bragg gratings were produced using the fibre deformation fabrication technique, with chirps of between 2.9nm and 17.3nm achieved. Arrays of 5mm and 2mm long uniform period Bragg gratings were fabricated using the inscription method, for use as true time delay elements,dissimilar wavefronts and their spectral characteristics recorded. The uniform period grating arrays were used to create

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32

LaPean, James William. "Analysis of infinite arrays of arbitrarily shaped planar radiating elements using a Floquet mode based Method of Moments approach." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-152047/.

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33

Kurup, Dhanesh G. "Active and Passive Unequally Spaced Reflect-Arrays and Elements of RF Integration Techniques." Doctoral thesis, Uppsala University, Signals and Systems Group, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3520.

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<p>Using an array synthesis tool based on a modified differential evolution algorithm, it is shown that the position-phase synthesis exhibits improved pattern characteristics compared to both the phase only and position only synthesis of uniform amplitude antenna arrays. The design of an unequally spaced planar reflect-array and an active power combining reflect-array are presented. The unit cell of the active reflect-array consists of an amplifying active reflect-antenna designed using a novel dual polarized microstrip-T coupled patch antenna. Two modelling approaches are proposed for the act

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34

Milbrandt, Jorick. "Études de nouvelles architectures d’antennes hybrides reconfigurables." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0121.

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Les travaux présentés dans ce mémoire portent sur l’étude des Antennes Reconfigurables à Formateur de Faisceaux Réduit. Le concept des ARFFR généralise les travaux d’Harrington sur les antennes ESPAR à des réseaux réguliers composés d’éléments excités et d’éléments parasites. Cette approche vise à simplifier le réseau formateur de faisceaux des antennes afin de démocratiser l’usage d’antennes reconfigurables performantes. L’utilisation de charges réactives connectées aux éléments parasites permet de maintenir un nombre de contrôles suffisant pour gérer le rayonnement de l’antenne et son adapta

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35

Trindade, Diego von Brixen Montzel. "Modelagem e simulação de metamaterial para isolamento de campo próximo entre elementos de antenas phased-array." Pontifícia Universidade Católica do Rio Grande do Sul, 2011. http://hdl.handle.net/10923/3221.

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Made available in DSpace on 2013-08-07T18:53:40Z (GMT). No. of bitstreams: 1 000432018-Texto+Completo-0.pdf: 4320652 bytes, checksum: a64c8fcf537e0eaf702be344c71f4af4 (MD5) Previous issue date: 2011<br>Phased-Array antennas are becoming the primary choice for wireless communication solutions. This is due to the fact that controllers already have the computational power required to deal with adaptive algorithms that control the amplitude and phase (through changes in the reactance) of the currents on the array elements in real-time. Along with the increased usage of this technology, the probl

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36

Abidin, Z. Z. "Design, modelling and implementation of antennas using electromagnetic bandgap material and defected ground planes. Surface Meshing Analysis and Genetic Algorithm Optimisation on EBG and Defected Ground Structures for Reducing the Mutual Coupling between Radiating Elements of Antenna Array and MIMO Systems." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5385.

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The main objective of this research is to design, model and implement several antenna geometries using electromagnetic band gap (EBG) material and a defected ground plane. Several antenna applications are addressed with the aim of improving performance, particularly the mutual coupling between the elements. The EBG structures have the unique capability to prevent or assist the propagation of electromagnetic waves in a specific band of frequencies, and have been incorporated here in antenna structures to improve patterns and reduce mutual coupling in multielement arrays. A neutralization

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Abidin, Zuhairiah Zainal. "Design, modelling and implementation of antennas using electromagnetic bandgap material and defected ground planes : surface meshing analysis and genetic algorithm optimisation on EBG and defected ground structures for reducing the mutual coupling between radiating elements of antenna array MIMO systems." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5385.

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The main objective of this research is to design, model and implement several antenna geometries using electromagnetic band gap (EBG) material and a defected ground plane. Several antenna applications are addressed with the aim of improving performance, particularly the mutual coupling between the elements. The EBG structures have the unique capability to prevent or assist the propagation of electromagnetic waves in a specific band of frequencies, and have been incorporated here in antenna structures to improve patterns and reduce mutual coupling in multielement arrays. A neutralization techni

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Trindade, Diego Von Brixen Montzel. "Modelagem e simula??o de metamaterial para isolamento de campo pr?ximo entre elementos de antenas phased-array." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2011. http://tede2.pucrs.br/tede2/handle/tede/3033.

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Made available in DSpace on 2015-04-14T13:56:20Z (GMT). No. of bitstreams: 1 432018.pdf: 4320652 bytes, checksum: a64c8fcf537e0eaf702be344c71f4af4 (MD5) Previous issue date: 2011-03-31<br>Antenas phased-array s?o cada vez mais utilizadas em solu??es de comunica??o wireless. Isto se deve ao fato de os processadores j? terem um poder computacional suficiente para lidar com algoritmos adaptativos que controlam a amplitude e a fase das correntes nos elementos do array em tempo-real. Junto com o crescente uso desta tecnologia surge o problema do acoplamento eletromagn?tico entre elementos. No cas

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Vouvakis, Marinos N. "A Non-Conformal Domain Decomposition Method for Solving Large Electromagnetic Wave Problems." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1125498071.

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Usman, Muhammad. "Investigation, Design and Implementation of MIMO Antennas for Mobile Phones. Simulation and Measurement of MIMO Antennas for Mobile Handsets and Investigations of Channel Capacity of the Radiating Elements Using Spatial and Polarisation Diversity Strategies." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4279.

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The objectives of this work were to investigate, design and implement Multiple-Input Multiple-Output (MIMO) antenna arrays for mobile phones. Several MIMO antennas were developed and tested over various wireless-communication frequency bands. The radiation performance and channel capacity of these antennas were computed and measured: the results are discussed in the context of the frequency bands of interest. A comprehensive study of MIMO antenna configurations such as 2 × 1, 3 × 1, 2 × 2 and 3 × 3, using polarisation diversity as proposed for future mobile handsets, is presented. The channel

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ʿUs̲mān, Muḥammad. "Investigation, design and implementation of MIMO antennas for mobile phones : simulation and measurement of MIMO antennas for mobile handsets and investigations of channel capacity of the radiating elements using spatial and polarisation diversity strategies." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4279.

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The objectives of this work were to investigate, design and implement Multiple-Input Multiple-Output (MIMO) antenna arrays for mobile phones. Several MIMO antennas were developed and tested over various wireless-communication frequency bands. The radiation performance and channel capacity of these antennas were computed and measured: the results are discussed in the context of the frequency bands of interest. A comprehensive study of MIMO antenna configurations such as 2 × 1, 3 × 1, 2 × 2 and 3 × 3, using polarisation diversity as proposed for future mobile handsets, is presented. The channel

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Madishetty, Suresh. "Design of Multi-Beam Hybrid Digital Beamforming Receivers." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1545178805415923.

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El, Kanfoud Ibtissam. "Résolution de problèmes de rayonnement électromagnétique appliqués à l’imagerie médicale avec FreeFEM++." Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4000/document.

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L'utilisation des microondes pour le diagnostic est en plein essor dans le domaine médical. Une des toutes dernières applications concerne la détection d'AVC (Accident vasculaire Cérébral) par imagerie microonde. La Société EMTensor GmbH basée à Vienne en Autriche étudie actuellement un tel système en collaboration avec le LEAT, le LJAD de l’Université Côte d’Azur et le LJLL de Sorbonne Université, pour le diagnostic et le contrôle de l'efficacité de traitement. Le but de ce travail était de modéliser le système de mesure de l'imagerie du cerveau, développé par la société EMTensor GmbH. Il s'a

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Chiniard, Renaud. "Contribution à la modélisation de la surface équivalente radar des grandes antennes réseaux par une approche multi domaine/Floquet." Toulouse 3, 2007. http://www.theses.fr/2007TOU30295.

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Cette étude propose de traiter les grandes antennes réseaux par une approche originale permettant d’atteindre des problèmes dont les grandes dimensions les rendent inaccessibles aux méthodes classiques et rigoureuses. Ainsi, la première partie est consacrée à la description des méthodes employées. La première d’entre elles est la méthode multi domaine qui permet de découper en sous domaines le problème initial. Chaque domaine est alors calculé à l’aide de la méthode numérique (équations intégrales, éléments finis,…) la plus appropriée dans le but d’obtenir un opérateur condensé (matrice S) pou

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Špatenka, Vojtěch. "Širokopásmové planární antény." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219837.

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In this master´s thesis an issue of broadband planar antennas was analyzed. Firstly, the basic elements that affect bandwidth, such as the influence of the dieletric substrate, suitable shape or feeding network, were described. Furthermore technics that can be used to widen the band of the planar antennas were described. These technics were applied to a chosen type of a planar antenna. This antenna was modeled and simulated for desired dielectric substrate in CST STUDIO SUITE 2010 software. Feeding network with power dividers was designed for the antenna array. In order to obtain a higher gain

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Weng, Shih-Tai, and 翁世泰. "Application in Phase Array Antenna Time Delay Element." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/wwmhah.

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碩士<br>逢甲大學<br>電機工程所<br>90<br>Abstract The method of fiber Bragg gratings used for the control and distribution of signals within microwave phased array antenna systems has been the subject of potential research over past several years. Its advantages have: small size, low losses, lightweight, and immunity to electromagnetic interferences. However, there have been several approaches for the beam-steering of a phased array antenna by using fiber grating technique. A typical approach is that a number of uniform fiber Bragg gratings written at different positions along fiber axis are used for

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Ji, Taeksoo. "A four element phased array antenna system monolitically implemented on silicon." 2004. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-646/index.html.

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Liu, Hsu-Feng, and 劉旭豐. "An Array Synthesis Technique to Reduce the Requirement of Element Antenna Polarization Purity and Improve MIMO Antenna Array Overall Cross Polarization Level." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/k2r9fv.

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碩士<br>國立交通大學<br>電信工程研究所<br>107<br>This thesis proposes an improved cross-polarization of two-port quadri-polarization diversity antenna design with three main layers. The upper layer is the antenna radiation layer. The antenna can be freely switched to the left or right handed circular polarization with PIN diodes and is arranged to a sequential rotation array. The advantage is that the sequential rotation array formed by the circularly polarized antenna can not only increase the bandwidth can also achieve low axial ratio of circular polarization and higher gain. The middle layer is a monopole

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Nalumakkal, Priya Suresh. "Ultrawideband and wide-angle scan antenna element and small active phased arrays." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6157.

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Wideband, wide-scan active phased arrays (APA) are widely used for multi-function radars, communication and electronic warfare. Although considerable research is available on the design and analysis of such antenna elements and arrays with large aperture, multi-octave wide scan phased antenna arrays with an electronically small aperture finds major application in electronic warfare (EW), is not well-developed. Based on a detailed literature survey on ultrawideband antenna for the wideband APA this research began with investigating different designs of tapered slot antenna (TSA) elements. A s

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Onwuegbuna, Leonard Ikemefuna. "Characteristics of the log periodic dipole array." Thesis, 2007. http://hdl.handle.net/10539/2164.

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Student Number : 9713144D - MSc Dissertation - School of Electrical Engineering - Faculty of Engineering and the Built Environment<br>The performance of the Log Periodic dipole array antenna has been characterized, in the form of parametric curves available in most antenna design handbooks and other relevant literature. These characteristic curves are often limiting in scope, as for instance they do not contain parametric curves giving the relationship between the boom-length 'L' and the number of dipole element 'N' for any given bandwidth, even when it is known that these two paramete

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