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Dissertations / Theses on the topic 'Antennas (Electronics) Radar'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

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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2

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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3

Brianeze, Juliano Rodrigues. "Um novo tipo de antena para radar aerotransportado : Yagi tridimensional." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261429.

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Orientadores: Hugo Enrique Hernandez Figueroa, Arismar Cerqueira Sodre Junior<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e Computação<br>Made available in DSpace on 2018-08-13T10:26:45Z (GMT). No. of bitstreams: 1 Brianeze_JulianoRodrigues_M.pdf: 7661922 bytes, checksum: 0d973e2e61c313de34e1ff70e57df18f (MD5) Previous issue date: 2008<br>Resumo: Sistemas embarcados usando Radar de Abertura Sintética (Synthetic Aperture Radar - SAR), em plataformas aerotransportadas ou orbitais, têm sido cada vez mais usados para sensoriamento remoto. Quand

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4

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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5

Tariq, Abubakar. "Vital signs monitoring using Doppler radar and on-body antennas." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4332/.

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The chest of a person moves due to the heart beating and the lungs expanding and contracting. So the chest movement contains information about the heart and breathing rates. This property is used to detect vital signs using Doppler radar and On-Body antennas. These methods can be accurate, cost-effective, portable, comfortable and low profile alternatives to present commercial heart and breathing rate monitoring devices. The 1st method employing Doppler Effect is non-contact. It detects both the heart and breathing rates using the modulated reflected signals from the chest of a person. A param

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6

Pooni, Sukhjit Singh. "Airborne MIMO radar with towed antenna array." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8202/.

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This thesis introduces an alternative type of radar system for airborne surveillance. The system comprises of a co-located Multiple-Input-Multiple-Output (MIMO) radar array that can be towed by an airborne platform. This could allow the realisation of a long antenna, giving a narrow beam-width, whilst optimising the trade-off between size/weight of a radar array and its length. As new concept, a system study of it operating onboard a high-altitudepseudo-satellite (HAPS) platform was done. Operating at 400MHz, it needed a 25m array having a weight of only 2.2kg, and had detection ground range o

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7

Gouws, Marcel. "Modelling of a monostatic borehole radar antenna." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2967.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.<br>The successful operation of a pulsed monostatic borehole radar system requires that cur- rent on the antenna due to transmitter pulses subsides quickly. Deterioration of the radar antenna feed-point current settling times when deployed in water-¯lled boreholes showed that the radar system's performance is highly environmentally sensitive. Electromagnetic models are used to investigate this e®ect, since measuring the feed-point and radiative characteristics of an insulated antenna deployed in a bo

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8

Van, Wyk M. D. "An active receiving antenna for borehole pulsed radar applications." Thesis, Stellenbosch : University of Stellenbosch, 2002. http://hdl.handle.net/10019.1/2521.

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Thesis (MEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2002.<br>An efficient radiating strucllire was needed for borehole pulsed radar applications in the 10-100 MHz frequency band. Both resistively loaded and insulated wire antennas were investigated and an active antenna is proposed as a fmal solution. The study proceeded from the characterization of the origin of radiation on a conductive dipole wire antenna when excited with a transient. Different radiation mechanisms were identified when the antenna was excited with a current or voltage source. The wire a

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9

Ibbotson, Alex. "The design and analysis of a rotman lens with reduced conjugate-port coupling." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71799.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: This project comprises the design, analysis, and construction of a Rotman lens with reduced conjugate-port coupling. The Rotman lens is a beam-forming network, used in wide-angle scanners to feed an antenna array. The scanning operation is based on optics and is therefore frequency invariant, a desirable feature of the Rotman lens compared to other beam-forming networks which employ phase shifters. The antenna array is connected to the lens's array ports via transmission lines. These array ports lie on the array contour

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10

Kellerman, Robert A. "The design of an FM-CW proximity radar." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50132.

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Thesis (MScEng) -- Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: The development of a small, cost effective short range FM-CW radar as well as the design and optimization of a double helix antenna is discussed. The FM-CW radar operates at Sband (2450 - 2550 MHz) and is limited at a maximum transmitted power of 5 dBm. The system is required to detect reflections from objects up to a 30 m range. This was made possible largely by the effective high gain antenna design and improved system isolation between the transmitted and received signals. The complete design process from fundament

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11

Birch, Max (Max Lariviere). "Development of a cavity backed bowtie antenna with dielectric matching for ground penetrating radar." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52186.

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Thesis (MScEng)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: An antenna for ground level deployed Ground Penetrating Radar applications is presented. The antenna is matched to the ground via a low impedance dielectric matching section improving the radiation pattern and input impedance characteristics. A bowtie antenna was used for the design with the edges rounded to stabilize the resonant frequency. The radiation pattern was focused to the one side of the antenna for ground penetration using a non-absorptive metallic cylindrical air filled cavity. Edge reflections from the

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12

Kornbau, Nathan Thomas. "Design and analysis of a wideband patch antenna for use with a miniature radar system." Diss., Connect to online resource - MSU authorized users, 2008.

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13

Morin, Matthew Robertson. "Design and Analysis of Receiver Systems in Satellite Communications and UAV Navigation Radar." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4210.

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The design of a low cost electronically steered array feed (ESAF) is implemented and tested. The ESAF demonstrated satellite tracking capabilities over four degrees. The system was compared to a commercial low-noise block downconverter (LNBF) and was able to receive the signal over a wider angle than the commercial system. Its signal-to-noise ratio (SNR) performance was poor, but a proof of concept for a low cost ESAF used for tracking is demonstrated. Two compact low profile dual circularly polarized (CP) reflector feed antenna designs are also analyzed. One of the designs is a passive antenn

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14

Ahmed, Amr. "Design And Optimization Of Uwb Antenna For Air Coupled Gpr Applications." ScholarWorks @ UVM, 2014. http://scholarworks.uvm.edu/graddis/262.

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This thesis presents a novel antenna structure that satisfies the challenging requirements of an air coupled high speed ground penetrating radar (GPR). The desired GPR system is to achieve high spatial resolution and accurate inspection results while scanning at relatively high speed for highway pavement and bridge deck inspection. This work utilizes the Ultra Wide Band (UWB) antenna design to achieve both physical and electrical requirements imposed. The design procedure starts with a short survey to discuss typical UWB antennas used for GPR applications, and various tradeoffs of each type sp

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15

Paine, Stephen Thomas. "Design and implementation of a dual polarised L-band parabolic dish antenna for NeXtRAD." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20510.

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Research into multi-static, multi-band networked radar has led to the development of the NeXtRAD radar system. This dissertation will investigate the design and implementation of a dual polarised L-Band prime focus dish antenna with a centre frequency of 1.3 GHz and a HPBW of 10° in the azimuth plane. The antenna is required to handle a peak power of 1.5 kW over a 50 MHz bandwidth and be able to withstand environmental factors such as wind while mounted on a tripod. This dissertation forms part of the larger NeXtRAD project and as such, the antenna design requirements have been set based on th

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16

Malan, Frederich T. "Reduction of the antenna coupling in a bi-static, FM-CW radar system." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18029.

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Thesis (MScEng)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: A well-known problem with FM-CW radar systems is the leakage of transmitter power into the receiver which leads to the making of close-in targets, and can severely limit the system dynamic range performance. This thesis considers two solutions to this radar system problem for a low frequency radar operating in the VHF band. The first method to suppress coupling is using separate transmit and receive antennas designed in such a way as to reduce coupling between them. The second is to design a negative feedback loop as part of

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17

Maritz, Andries Johannes Nicolaas. "Investigation and design of a slotted waveguide antenna with low 3D sidelobes." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4161.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: An investigation into the cause of undesired sidelobes in the 3D radiation pattern of slotted waveguide arrays is conducted. It is hypothesized that the cross-polarization of the antenna is at fault, along with the possibility that an error is made when designing a linear array. In investigating and finding a solution to the problem, the “Z-slot ” is introduced in conjunction with polarizer plates. The base components are used by a custom optimization algorithm to design refere

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18

Reilly, Nicholas James. "Cmos Programmable Time Control Circuit Design For Phased Array Uwb Ground Penetrating Radar Antenna Beamforming." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/687.

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Phased array radar systems employ multiple antennas to create a radar beam that can be steered electronically. By manipulating the relative phase values of feeding signals among different antennas, the effective radiation pattern of the array can be synthesized to enhance the main lobe in a desired direction while suppressing the undesired side lobes in other directions. Hence the radar scanning angles can be electronically controlled without employing the bulky mechanical gimbal structure, which can significantly reduce radar system size, weight and power consumption. In recent years, phased

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19

Louertani, Karim. "Conception d'antennes spirales large bande à alimentation coplanaire pour des applications radar sur dirigeable." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00815267.

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Un dirigeable haute altitude (HAA: High Altitude Airship) évoluant à plus de 20 km au-dessus du sol est envisagé en tant que plate-forme d'accueil pour un réseau d'antennes spirales pour des applications radar. L'antenne spirale d'Archimède est un excellent élément rayonnant pour des applications nécessitant une large bande de fréquences ainsi qu'une polarisation circulaire. Dans la plupart des cas, l'alimentation se fait au centre de l'antenne spirale. Cependant, certains environnements interdisent un accès au centre de l'antenne. Cela est notamment le cas des plateformes aéroportées tels que

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20

Sterne, Kevin Tyler. "Testing the Re-designed SuperDARN HF Radar and Modeling of a Twin Terminated Folded Dipole Array." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32239.

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The Super Dual Auroral Radar Network (SuperDARN) is an international collaboration of researchers interested in Earthâ s near-space plasma environment. This group uses high frequency (HF) radars and backscatter from magnetic field-aligned plasma irregularities to study space weather manifested in the Earthâ s magnetosphere and ionosphere. Space weather impacts many technological systems including Global Positioning System (GPS), spacecraft orbits, power distribution, surveillance radar, HF communications and transpolar aviation. This thesis explores, in detail, the techniques and challe

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21

Ogintas, Andrius. "Radiolokatoriaus antenų kryptinių diagramų matavimo sistemų tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2007. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20070629.144432-59310.

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Baigiamajame magistro darbe, analitinėje dalyje, pateikta žinomi radiolokatorių antenų elektromagnetinio spinduliavimo kryptinių diagramų matavimo būdai bei svarbiausios matavimo sistemos dalies – imtuvo projektavimo teorija. Eksperimentinėje magistro darbo dalyje panagrinėti būsimi kryptinių diagramų nustatymo būdai, vienas iš jų - panaudojant elektromagnetinių bangų išsibarstymą ore. Pagal žinomus duomenis apie šį efektą sudaryta nauja alternatyvi sistema, kuri leidžia pagreitinti, sumažinti laiko bei materialines sąnaudas atliekant periodinius kryptinių diagramų matavimus ir pateiktos bendr

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22

Petersson, Björn. "Modeling of a Retrodirective Channel With Active Antenna Arrays for Cross-Eye Jamming." Licentiate thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217232.

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Cross-Eye (CE) jamming is a technique aimed at inducing false target angles in radar measurements. The potential to deceive monopulse radar, a radar type commonly used due to its angular accuracy and resilience against jamming, has captured the interest of Electronic Warfare (EW) system manufacturers. CE jamming may increase the capability of self-defense against radar guided missiles. In this thesis, a CE jammer, based on the retrodirective channel design, for use in an EW systems is modeled and analyzed. The focus of the analysis is on the non-reciprocal Active Electronically Scanned Arrays

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23

Bellomo, Lucio. "Étude et réalisation d'un radar ULB à conjugaison de phase en micro-ondes." Phd thesis, Toulon, 2012. http://tel.archives-ouvertes.fr/tel-00703376.

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Cette thèse s'inscrit dans le domaine de l'imagerie non-destructive en électromagnétisme. L'originalité du travail réside, tout d'abord, dans sa forte connotation expérimentale. Celle-ci a abouti à la construction d'un prototype RADAR capable d'acquérir des données multisources-multistatiques dans la gamme de fréquence [2-4] GHz. De plus, ce système implémente la formation de voies au moyen d'un réseau d'atténuateurs/déphaseurs commandé numériquement.Les expériences menées relèvent, d'une part, de l'imagerie qualitative. Le Retournement Temporel, ainsi que les méthodes DORT et TR-MUSIC, ont ét

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24

Correia, Bruno Filipe Oliveira. "Metamaterial Antennas for RADAR and SAR." Dissertação, 2002. https://repositorio-aberto.up.pt/handle/10216/114022.

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Os sistemas de RADAR e Radar de Abertura Sintética (SAR) necessitam de antenas diretivas com banda larga. Para as antenas serem diretivas é necessário que estas sejam grandes, o que é impraticável em muitas aplicações. As antenas com metamateriais são construídas usando estruturas miniaturizadas complexas que permitem que antenas pequenas se comportem como antenas consideravelmente maiores. O objetivo desta tese é obter um conjunto baseado em pequenas antenas com tais propriedades, de forma a obter uma antena diretiva e de banda larga, passível de ser usada para operações de RADAR e SAR.<br>RA

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25

Correia, Bruno Filipe Oliveira. "Metamaterial Antennas for RADAR and SAR." Dissertação, 2018. https://hdl.handle.net/10216/114022.

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Os sistemas de RADAR e Radar de Abertura Sintética (SAR) necessitam de antenas diretivas com banda larga. Para as antenas serem diretivas é necessário que estas sejam grandes, o que é impraticável em muitas aplicações. As antenas com metamateriais são construídas usando estruturas miniaturizadas complexas que permitem que antenas pequenas se comportem como antenas consideravelmente maiores. O objetivo desta tese é obter um conjunto baseado em pequenas antenas com tais propriedades, de forma a obter uma antena diretiva e de banda larga, passível de ser usada para operações de RADAR e SAR.<br>RA

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26

Correia, Bruno Filipe Oliveira. "Metamaterial Antennas for RADAR and SAR." Master's thesis, 2018. https://hdl.handle.net/10216/114022.

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Os sistemas de RADAR e Radar de Abertura Sintética (SAR) necessitam de antenas diretivas com banda larga. Para as antenas serem diretivas é necessário que estas sejam grandes, o que é impraticável em muitas aplicações. As antenas com metamateriais são construídas usando estruturas miniaturizadas complexas que permitem que antenas pequenas se comportem como antenas consideravelmente maiores. O objetivo desta tese é obter um conjunto baseado em pequenas antenas com tais propriedades, de forma a obter uma antena diretiva e de banda larga, passível de ser usada para operações de RADAR e SAR.<br>RA

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27

Du, Plessis W. P. (Warren Paul). "A comprehensive investigation of retrodirective cross-eye jamming." Thesis, 2010. http://hdl.handle.net/2263/25480.

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Cross-eye jamming is an Electronic Attack (EA) technique that induces an angular error in the radar being jammed. The main benefit of cross-eye jamming is that it is effective against monopulse tracking radars, which are largely immune to other forms of jamming. The objective of this research is to gain a complete understanding of cross-eye jamming so that systems that might be developed in future can be properly specied. The main contribution of this work is a comprehensive mathematical and experimental study of retrodirective cross-eye jamming. The mathematical analysis considers all aspects

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28

Lin, Adrian. "A low-complexity radar for human tracking." Thesis, 2006. http://hdl.handle.net/2152/2566.

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