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Dissertations / Theses on the topic 'Steerable antennas'

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Published: 4 June 2021

Last updated: 9 February 2022

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1

Pat, Terrance, and Terrance Pat. "Electronically Steerable Inflatable Antennas." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/626342.

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In today’s technologically driven world, antennas play an essential role in enabling wireless communications over long distances and allow communities to interact on a global scale. Typically, this is done using large networks of antenna systems on the ground and in space to ensure signals reliably arrive at their destinations, which can be very expensive in terms of replacement cost and maintenance as the number of nodes increase. We shall be discussing a new method for deploying space-borne antennas via CubeSats that will enable high speed communications with the ground and other satellites

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2

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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Noujeim, Karam M. "Fixed-frequency beam-steerable leaky-wave antennas." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0016/NQ45831.pdf.

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4

Gokalp, Nihan. "Beam Steerable Meanderline Antenna Using Varactor Diodes And Reconfigurable Antenna Designs By Mems Switches." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609982/index.pdf.

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Recently, reconfigurable antennas have attracted significant interest due to their high adaptation with changing system requirements and environmental conditions. Reconfigurable antennas have the ability to change their radiation pattern, frequency or polarization independently according to the application requirements. In this thesis, three different reconfigurable antenna structures have been designed<br>beam-steerable meanderline antenna, dual circularly polarized meanderline antenna and dual-frequency slot-dipole array. Traveling wave meanderline antenna arrays are investigated in detail

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Uchendu, Iyemeh E. "Passive amplitude and hybrid parasitic beam steerable array antennas." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/845688/.

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Highly directive antennas with beam steering capabilities are needed to overcome high path-loss, mitigate against interference from unwanted signals and to ensure network connectivity for the next generation 5G millimetre wave communication systems. Phased arrays using phase shifters are the conventional approach of achieving beam steerable antennas. However, due to the insertion loss incurred by phase shifters and the high cost of acquiring phase shifters, alternative solutions that offers lower loss and cost are being researched. This work proposes two beam steerable antenna solutions that o

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6

Cha, Jun Ho. "A steerable array antenna using controllable microwave dielectric slab phase shifters on a coplanar waveguide /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/5824.

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7

Alfonso, Alós Esperanza. "New quasi-TEM waveguides using artificial surfaces and their application to antennas and circuits." Doctoral thesis, Universitat Politècnica de València, 2011. http://hdl.handle.net/10251/11073.

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Research interest: In recent years we have seen the emergence of commercial applications at high frequencies, such as the top part of the microwave band and the millimeter and sub-millimeter bands, and it is expected a big increase in the coming years. This growing demand requires a rapid development of low-cost technology with good performance at these frequencies, where common technologies, such as microstrip and standard waveguides, have some shortcomings. In particular, existing solutions for high-gain planar scanning antennas at these frequencies su er from the disadvantages of t

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Goonesinghe, Chandana Hasanga. "Software controlled beam steerable antenna." Thesis, Swansea University, 2018. https://cronfa.swan.ac.uk/Record/cronfa43709.

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In this thesis I have presented a software controlled conformal beam steerable antenna for body wearable applications. The antenna is a square loop antenna conformal to a hemispherical shell. It generates 4 identical tilted beam patterns with high Directivity (9.2dBi). It has 4 RF ports which are connected to a RF switch which conducts the beam switching based on the electronic voltages it receives from a control circuit. By switching one port at a time, while keeping the remaining 3 ports open, it is able to steer the beam covering the full 360° azimuth range. An intelligent ’scan, analyse, l

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9

Le, Goff Denis. "Steerable antenna design based on liquid metal actuation." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0152/document.

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L’apparition des objets connectés intelligents dont nous sommes les témoins depuis quelques années a généré un besoin croissant d’antennes à bas coût et énergétiquement sobres. La capacité d’effectuer à la volée une mise en forme du faisceau où sa reconfiguration est une propriété particulièrement intéressante, qui pourrait permettre à l’objet intelligent d’effectuer des tâches telles que la surveillance de zone par exemple ou bien d’optimiser son bilan de liaison en ne visant qu’une seule direction de l’espace. Cela pourrait également mener à un accroissement de l’autonomie de l’objet, via un

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10

Vikan, Svein. "Steerable Antenna Solution for Communication between Cars." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9539.

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<p>This thesis describes the work on designing and testing an antenna solution for communications between cars. The antenna that is to be used is a so called ESPAR antenna or Electronically Steerable Passive Array Radiator using monopoles over a circular ground plane. Simulations were made on the following variations of the antenna: The number of passive monopoles and the angle between them The radius and height of the active and passive monopoles The height of the skirt and the radius of the ground plane Matching schemes The antenna that was decided to be the best for this applica

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11

Soo, C. B. "Phase locked loop analysts for steerable antenna arrays." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487377.

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The purpose of this work was to produce novel Phase Locked Loops (PLL) architectures for antenna array applications. The operational characteristics of these PLLs architectures are presented and are analysed theoretically. The first type ofPLL ar.c. hitecture presented is called the Phase Conjugating Locked Loops (PCLL). Three different topologies for this type are designed to provide the phase conjugation operation necessary for retrodirective antenna array action. PCLL .Type 1 operates under the circumstance that input radio frequency roRF is different . from the VCO output frequency rovco w

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12

Luther, Justin. "Microstrip Patch Electrically Steerable Parasitic Array Radiators." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5984.

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This dissertation explores the expansion of the Electrically Steerable Parasitic Array Radiator (ESPAR) technology to arrays using microstrip patch elements. Scanning arrays of two and three closely-coupled rectangular patch elements are presented, which incorporate no phase shifters. These arrays achieve directive radiation patterns and scanning of up to 26° with maintained impedance match. The scanning is effected by tunable reactive loads which are used to control the mutual coupling between the elements, as well as additional loads which compensate to maintain the appropriate resonant

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13

Hossain, Mohammad Ababil. "Beam Steerable Reconfigurable Antenna with Smart RF Switching on 3D Parasitic Level." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/5483.

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Traditional antennas have a lot of limitations as their performance is usually fixed by their initial geometry. On the other hand, modern communication systems are getting way to complicated compared to their earlier counterparts. This necessitates some special types of smart or reconfigurable antennas, which can dynamically adapt to the requirements of the communication systems more effectively. Using conventional single functional antennas is therefore not an efficient approach in these sort of communication systems. Considering all these factors, in this thesis, a beam steerable reconfigura

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14

Hendrantoro, Gamantyo. "Characterization of 29.5 GHz broadband indoor radio channels using a steerable receive antenna." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22120.pdf.

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15

Hendrantoro, Gamantyo Carleton University Dissertation Engineering Systems and Computer. "Characterization of 29.5 GHz broadband indoor radio channels using a steerable receive antenna." Ottawa, 1997.

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16

Qian, Rongrong. "The electronically steerable parasitic array radiator antenna for wireless communications : signal processing and emerging techniques." Thesis, Heriot-Watt University, 2015. http://hdl.handle.net/10399/3001.

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Smart antenna technology is expected to play an important role in future wireless communication networks in order to use the spectrum efficiently, improve the quality of service, reduce the costs of establishing new wireless paradigms and reduce the energy consumption in wireless networks. Generally, smart antennas exploit multiple widely spaced active elements, which are connected to separate radio frequency (RF) chains. Therefore, they are only applicable to base stations (BSs) and access points, by contrast with modern compact wireless terminals with constraints on size, power and complexit

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17

Abdul, Malek Norun F. "3-D antenna array analysis using the induced EMF method." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13385.

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The effect of mutual coupling between elements plays a crucial role to the performance of the antenna arrays. The radiation patterns of antenna arrays will be altered by the coupling effect from the adjacent elements thus reducing the accuracy and resolution in direction finding application. This research developed and validated the novel 3-D Algorithm to calculate the far-field pattern of dipole arrays arranged in three dimensions and in any configuration (both in straight and slanted position). The effect of mutual coupling has been accounted using the Induced EMF method. The computation is

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18

Harck, Alexandre. "Conception et validation de déphaseurs large bande intégrant des MEMS-RF dans un environnement hostile." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0044/document.

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Ces travaux de recherches s’inscrivent dans le cadre d’une amélioration du bilan de liaison des données de télémesures sur les lanceurs spatiaux. Pour cela, un dispositif d’antenne à pointage électronique a été choisi. Celui-ci utilise un réseau de quatre antennes patchs alimentés par un prototype composé d’un diviseur de puissance 1 vers 4 et de quatre déphaseurs. Les états de phases choisis pour chacun des déphaseurs sont 0°, 90° et 180°. Après une étude bibliographique, les meilleurs déphaseurs pouvant assurer cette fonction sont les déphaseurs à base de coupleur hybride. Grâce à l’utilisat

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19

Kövamees, Johan. "Electrically Steerable Phased-Arrays for 5G Sub-6 GHzMassive MIMO Active Antenna Units : Re-configurable Feed Networks." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-420712.

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During this project we have designed a new type of antenna that uses an array of antenna elements in order to emit electromagnetic radiation as signals and to be able to control the beam. After an extended time the design yielded a simulation which had the correct characteristics. After printing and constructing a prototype of the antenna it was tested in an anechoic chamber at Uppsala University. The array was divided into two different sub-arrays: the upper and the lower sub-arrays. Each of these consisted in itself of two sides: the long and the short sides. Each side had seven radiating el

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Nielson, Mark William. "Analog Adaptive Calibration for Arbitrary Phased Array Configuration." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7132.

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The development of phased array antenna systems requires considerable resources and time. Due to this constraint, the Naval Air Command (NAVAIR) needs a phased array that can be physically reconfigured to meet the demands of multiple missions without added development time or cost. This work develops and demonstrates a solution to this problem by implementing an adaptive calibration approach to the development of electronically steerable antennas (ESAs). In contrast to previous analog adaptive beamformer systems, this system allows for an arbitrary antenna configuration with a variable number

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21

Kruger, Iwan Carel. "An aircraft based emulation platform and control model for LEO satellite antenna beam steering." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5200.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: A joint project between the KU Leuven and Stellenbosch Universities was at the time of this thesis underway to develop a space borne electronically beam steerable antenna and the associated ground-space segments. This thesis covers the development of an aircraft based satellite emulator to facilitate convenient aircraft based testing of an antenna array, intended for low earth orbit satellite deployment and subsystems to control the antenna array. A flight strategy is develope

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22

Muhammad, Murtala. "Enhancing the energy efficiency of ultra wideband (UWB) based media access control (MAC) protocols in mobile ad-hoc networks (MANETs) through the use of steerable directional antenna." Thesis, University of Salford, 2018. http://usir.salford.ac.uk/46756/.

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Energy efficiency contributes to the survival of nodes in Mobile Ad Hoc Networks (MANETs). The use of directional antennas can conserve energy due to the increased gain and directed transmission towards specific point in space. Directional antennas also resolve many issues associated with interference from different points within the network. Despite the vast body of work in this area, research on the way directional antennas access the wireless medium specific to Ultra-WideBand (UWB) systems have not gained wide attention. The aim of this research is to design, implement and test an improved

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23

Gaja, Tomáš. "Návrh anténní řady pro MSPS radar pracující v pásmu L." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316426.

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This thesis deals with the design of an antenna array for the MSPS Radar L band application. The introduction covers a research for a suitable antenna element which can be used as an element of steerable antenna array. The control of the main beam is enabled in the vertical plane. Based on a presented theory, a slotted waveguide antenna array with an omnidirectional radiation in the vertical plane is designed. The operating frequency is set to 1 367.5 MHz. Slotted array achieves 20° width of the main beam in elevation plane. The achieved gain of the array is 9.15 dBi. Further attention of this

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24

Koenen, Christian [Verfasser], Thomas F. [Akademischer Betreuer] Eibert, Thomas F. [Gutachter] Eibert, and Ulrich [Gutachter] Stroth. "Steerable Millimeter-Wave Gaussian Beam Shaping Phased Array Antenna for Doppler Reflectometry of Nuclear Fusion Plasma Turbulence in ASDEX Upgrade Tokamak / Christian Koenen ; Gutachter: Thomas F. Eibert, Ulrich Stroth ; Betreuer: Thomas F. Eibert." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1207075027/34.

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25

Hsu, Teng-Wei, and 許登偉. "Using Steerable Directional Antennas to Improve the Performances of IEEE 802.16(d) Mesh Networks." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/09259772761735941534.

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碩士<br>國立交通大學<br>網路工程研究所<br>95<br>The IEEE 802.16(d) mesh network is a promising next-generation wireless backbone network. This network requires that all network nodes should be equipped with an omni-directional antenna (or an directional antenna array emulating it). Exploiting the spatial reuse property of directional antennas in such networks is a great challenge. In this thesis, instead of collocating directional antennas to emulate omni-directional antennas, we propose a novel design using only one steerable directional antenna for each node. Our design can better exploit the advantages o

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Lee, Jun Yi, and 李俊毅. "Design of 40GHz Beam-Steerable Phased Array Antenna." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3r2h42.

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27

Chen, Wei-Chih, and 陳韋至. "Research of High Gain Beam-Steerable MIMO Antenna." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/rz9s9s.

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博士<br>國立高雄科技大學<br>電子工程系<br>107<br>Looking forward to the emerging "5G" (5th generation mobile networks) generation, due to the adoption of higher frequency bands, the problem of space propagation loss is much more serious. It is necessary to develop the advanced antenna pattern control and beam-forming technology to fulfill the growing demand for communication needs. The traditional beam steering mechanisms have common shortcomings: the structure is complex, the volume is huge, the attenuation is serious and the cost-effectiveness is not good. Therefore, this thesis focuses on how to simplify

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28

Lu, Jou-Hung, and 陸柔宏. "X-band Circularly Polarized Antenna with Steerable Main Beam." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/60240097498152126755.

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碩士<br>國立交通大學<br>電信工程研究所<br>103<br>In this thesis, circular polarized array antenna with steerable main beeam applied to X-band satellite communications system has been designed, and the operating frequency is 8.2GHz. The structure includes a circularly polarized antenna array, phase shifter, power divider, amplifier and the other components. Whether the antenna main beam can accurately point to the purpose of the communication satellite, the design of these elements are dependent on the effective components. In view of this, this thesis intends to reasearch X-band circularly polarized antenna

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29

Abdalla, Mohamed. "Metamaterial-Inspired CMOS Tunable Microwave Integrated Circuits For Steerable Antenna Arrays." Thesis, 2009. http://hdl.handle.net/1807/17720.

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This thesis presents the design of radio-frequency (RF) tunable active inductors (TAIs) with independent inductance (L) and quality factor (Q) tuning capability, and their application in the design of RF tunable phase shifters and directional couplers for wireless transceivers. The independent L and Q tuning is achieved using a modided gyrator-C architecture with an additional feedback element. A general framework is developed for this Q- enhancement technique making it applicable to any gyrator-C based TAI. The design of a 1.5V, grounded, 0.13um CMOS TAI is presented. The proposed circuit ac

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30

Berger, Jonathan Michael. "Low Cost Direction Finding with the Electronically Steerable Parasitic Array Radiator (ESPAR) Antenna." Thesis, 2006. http://hdl.handle.net/10539/1499.

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Faculty of Engineering and the Built Environment; School of Electrical and Information System; MSC Dissertation<br>In this paper, the Electronically Steerable Parasitic Array Radiator (ESPAR) antenna, developed by the Advanced Telecommunications Research Institute (ATR) in Japan was analyzed to determine its feasibility as a low cost direction finding (DF) system. Simulations of the antenna were performed in SuperNEC and Matlab was used to determine the direction of arrival (DOA) using the Reactance Domain multiple signal classification (MUSIC) algorithm. Results show the ideal configurat

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31

Bembe, Mncedisi Jacob. "Structural parameter based design and optimisation for dual-band ESPAR antenna system." Thesis, 2012. http://hdl.handle.net/10210/4524.

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M.Ing.<br>This work considers a dual band electronically steerable parasitic array radiator (ESPAR) antenna system. This system is designed with one actively fed radiating element and N-parasitic radiating elements. The radiation pattern can be electronically controlled by means of the loads terminating the parasitic elements. The antenna system is designed as ESPAR to have a minimum number of controlling elements thereby minimising the power consumed. The dual band operation of this antenna is for the frequency bands of the wireless local area network (WLAN), which are 2.412-2.482 GHz for IEE

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