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Dissertations / Theses on the topic 'Reflector'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Mousari, Bafrooei Seyed Pedram. "Reflector feeds for large adaptive reflector antennas." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ57513.pdf.

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2

Durnan, Gregory J. "Parasitic Feed Elements for Reflector Antennas." Thesis, Griffith University, 2005. http://hdl.handle.net/10072/368077.

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The use of parasitic wire dipoles are examined when placed in the proximity of a focused dipole feed in a parabolic reflector antenna. These parasitic elements are rotated around the feed dipole and a search is performed for the ideal positioning so as to yield maximum radiated power and main beam shift in order to develop a novel form of angle diversity. In addition a comparison is made between 2 element dipole feed structures and linearly and circularly polarised patch feed structures. In order to analytically model the structure, mutual coupling between feed elements is calculated taking in

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3

Shen, Bing. "Multiple reflector scanning antennas." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40108.

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4

Wang, Yang. "Time-modulated reflector-arrays." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/8510/.

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This PhD thesis introduces the time-modulated reflector-arrays which are a hybrid of conventional time-modulated array (TMA) systems and reflectarrays. The TMRAs use a similar layout of reflectarray feed by a source. Compared to conventional phased arrays, reflectarrays and time-modulated arrays, a TMRA is potentially simpler to implement in hardware as it does not need a complicated feeding network or the use of the phase shifting units. Instead of phase shifting units, TMRAs use discrete time-switching to achieve beamforming functions. The concept and operating mechanism of the TMRA is expla

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5

Mas, Baixeras Albert. "Optimization of inverse reflector design." Doctoral thesis, Universitat de Girona, 2011. http://hdl.handle.net/10803/22705.

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Aquesta tesi presenta un nou mètode pel disseny invers de reflectors. Ens hem centrat en tres temes principals: l’ús de fonts de llum reals i complexes, la definició d’un algoritme ràpid pel càlcul de la il•luminació del reflector, i la definició d’un algoritme d’optimització per trobar més eficientment el reflector desitjat. Les fonts de llum estan representades per models near-field, que es comprimeixen amb un error molt petit, fins i tot per fonts de llum amb milions de raigs i objectes a il•luminar molt propers. Llavors proposem un mètode ràpid per obtenir la distribució de la il•luminac

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6

Stewart, Scot Howard. "Multiple feed reflector antenna analysis." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94472.

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A method of calculating the secondary pattern of a reflector illuminated by a feed array is developed. Geometrical optics is used to determine the incident field via a coordinate transformation approach. The incident field from each element is superimposed to form the total field used in finding the surface currents of the physical optics radiation integral. The technique allows each element to be arbitrarily excited, positioned and oriented. The element patterns may be different allowing mutual coupling to be included.<br>M.S.

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7

Fournier, Florian. "FREEFORM REFLECTOR DESIGN WITH EXTENDED SOURCES." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3146.

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Reflector design stemmed from the need to shape the light emitted by candles or lamps. Over 2,000 years ago people realized that a mirror shaped as a parabola can concentrate light, and thus significantly boosts its intensity, to the point where objects can be set afire. Nowadays many applications require an accurate control of light, such as automotive headlights, streetlights, projection displays, and medical illuminators. In all cases light emitted from a light source can be shaped into a desired target distribution with a reflective surface. Design methods for systems with rotational and t

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8

Parkinson, Joseph R. "The analysis of microwave reflector antennas." Thesis, University of Birmingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342108.

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9

Sterr, U. "Radiation characteristics of corner reflector antennas." Thesis, Queen Mary, University of London, 1998. http://qmro.qmul.ac.uk/xmlui/handle/123456789/1686.

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This thesis presents a study of the radiation characteristics of corner reflector antennas. The influence of the design parameters on the radiation characteristics are assessed using an analytical method and the Finite Difference Time Domain (FDTD) method. The FDTD method for corner reflector antennas which are electrically small to medium sized antennas is developed in detail. The important subject of the Absorbing Boundary Conditions (ABCs) is studied including a study of Mur ABC and Perfectly Matched Layers. It is shown that both methods reduce the reflections from the boundaries sufficient

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10

PEREIRA, LUIS CLAUDIO PALMA. "ASYMPTOTIC ANALYSIS OF SHAPED REFLECTOR ANTENNAS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1988. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8374@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Este trabalho apresenta uma nova técnica para aproximação de uma superfície refletora definida numericamente, i.e., por pontos fornecidos pelo processo de síntese da antena. As limitações inerentes às técnicas usuais são aqui eliminadas pela utilização de Pseudo-Splines Quínticas que interpolam uma distribuição arbitrária de pontos por uma superfície suave, com derivadas primeiras e segundas contínuas, assegurando uma representação única para o domínio de interesse. O procedimento é, então, aplicado ao subrefletor modela

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11

Tan, Lin Tze. "Thin-walled elastically foldable reflector structures." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619853.

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12

Crabtree, Karlton. "Polarization Conversion Cube Corner Retro-Reflector." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195564.

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This document presents the polarization conversion cube-corner retroreflector (PC-CCR). The PCCCR is a cube-corner retroreflector which transforms the electricfield as follows: the major axis is rotated by 90° and the handedness is reversed.Since the polarization properties of a CCR are dependent on the polarization properties of each surface, exploration of the space of Mueller matrices is organized by surface type. The Mueller matrix of CCR having each of several surface types is calculated, including the traditional hollow metal and solid glass CCR types. PCCCR only occur for non-isotropic

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13

ZANG, SANDRO ROGERIO. "SYNTHESIS AND RIGOROUS ANALYSIS OF OMNIDIRECTIONAL DUAL-REFLECTOR ANTENNAS: THE CASE OF THE MAIN REFLECTOR WITH CIRCULAR GENERATRIX." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2010. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=20767@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Este trabalho aborda o projeto de antenas omnidirecionais de duplorefletores, onde o refletor principal é obtido a partir de uma geratriz circular. A antena é composta de refletores circularmente simétricos e concêntricos que são alimentados por uma corneta cônica coaxial excitada pelo modo TEM para a produção de polarização vertical. Para realizar este estudo são utilizadas técnicas de síntese e de análise eletromagnética rigorosa. A técnica de análise eletromagnética rigoros

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14

Armas, Nelson A. "Low sidelobe reflector antenna design for communications." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA276079.

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15

Graham, R. K. "Numerical synthesis of dual-reflector antenna systems." Thesis, University of Southampton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373929.

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16

Rosenbusch, Peter. "Atom optics with an adaptable magnetic reflector." Thesis, University of Sussex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341516.

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17

You, Zhong. "Deployable structures for masts and reflector antennas." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240014.

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18

MOREIRA, FERNANDO JOSE DA SILVA. "FEED ARRAY REFLECTOR ANTENNAS FOR SHAPED BEAMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1992. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8839@1.

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Este estudo tem como tema a análise dos campos radiados por um conjunto de alimentadores para a iluminação de um sistema único refletor embarcado em satélite, utilizando para a produção de diagramas modelados. É usada uma técnica para o tratamento do acoplamento mútuo entre os campos de aberturas retangulares num plano condutor elétrico infinito, de forma que os alimentadores aqui tratados serão guias retangulares abertos e cornetas piramidais. Uma formulação assintótica inédita foi desenvolvida para o aclopamento entre duas aberturas afastadas entre si. Como aplicação foram realizad

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19

Im, Myung Jin. "Tolerance analysis of synthesized dual-reflector antennas." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12472.

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20

Cortes-Medellin, German, Stefan O'Dougherty, Christopher Walker, et al. "Optical design for the large balloon reflector." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622510.

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We present the details of the optical design, corrector system, mechanical layout, tolerances, pointing requirements, and overall performance of the sub-millimeter wavelength Large Balloon Reflector telescope (LBR).

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21

Pokhrel, Shiva Prasad. "Design of a plasmonic Bragg reflector cavity." Thesis, University of Massachusetts Boston, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1599250.

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<p> A plasmon based Bragg reflector cavity is designed and studied. In order to design the plasmon based Bragg cavity, reflectivity with and without loss are calculated using the transfer matrix method. The simulated Bragg reflector showed better performance as the period increased and achieved 95.16% reflectivity with no loss and 94.94% reflectivity when the predominantly plasmon based losses are included in the 120 period calculation. Plasmon based cavities have been proposed for those instances where high field interactions are required to occur in the near surface region of a semiconduct

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22

Vered, Nissan. "Method of moments analysis of displaced-axis dual reflector antennas." Thesis, Monterey, Calif. : Naval Postgraduate School, 1992. http://handle.dtic.mil/100.2/ADA247970.

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23

Pye, John Downing Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "System modelling of the compact linear Fresnel reflector." Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2008. http://handle.unsw.edu.au/1959.4/41244.

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The Compact Linear Fresnel Reflector is a solar thermal energy system currently at prototype stage in Australia. The system uses parallel rows of mirrors lined up underneath a long, elevated thermal absorber. The mirrors move so as to focus solar radiation onto the absorber; the absorber contains a bank of high-pressure water pipes through which water is pumped and gradually boils. The process of ??direct steam generation?? in very long pipes, up to 300 m in a straight run, has not previously been performed at this scale; other systems use shorter pipe runs, or use other fluids such as non-boi

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24

REGO, CASSIO G. "APPROXIMATION OF SHAPED REFLECTOR SURFACES BY PSEUDO-SPLINES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1991. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9254@1.

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Neste trabalho, a técnica de interpolação de superfícies definidas numericamente por pseudo-splines é aplicada a antenas refletoras offset e com alto grau de modelagem. É feito um estudo comparativo com técnica de interpolação alternativa levando-se em conta os diversos métodos de análise de antenas refletoras.<br>In this work, the pseudo-spline technique for numerically defined surfaces is applied to the approximation of single and dual-shaped offset reflector antennas. A comparative study with an usual alternative technique is undertaken, emphasizing the implications observed when d

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25

Lai, Cheuk-Yan. "Analysis and design of a deployable membrane reflector." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621226.

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26

Alphonse, Stephanie. "Fast analysis of a compound large reflector antenna." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20196.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: The o set Gregorian dual re ector antenna is eminently well suited to a radio telescope antenna application as it o ers a narrow beam width pattern (i.e high gain) and good e ciency. The focus of this work is on the analysis of characteristics of such a Gregorian antenna. The design of the class of re ector antennas is normally based on the use of ray-optics, with this simpli ed approach being able to predict antenna performance based on approximate formulas for example the beam width against aperture size. However fo

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27

Bahadori, Keyvan. "Spaceborne reflector antennas for advanced remote sensing applications." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1562125061&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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28

Luo, Hui. "Tapered cavity surface emitting distributed Bragg reflector lasers." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/284102.

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High power, diffraction-limited semiconductor lasers are required for a wide range of applications such as pumping for EDFAs, Raman amplifiers, and for free space optical communications. Unstable resonator has been identified as a very promising concept to develop these lasers. The objective of this research is to investigate and develop tapered cavity unstable resonator grating coupled surface emitting lasers (TCSELs). The laser consists of a ridge section, a tapered gain section and a DBR grating section. The ridge is used to ensure single lateral mode operation. The taper is used to achieve

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29

Cheng, Chin-Yuan. "Numerical electromagnetic modeling of a small aperture helical-fed reflector antenna." Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1176838193.

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30

Nilsson, Josefine. "Optical durability of reflector materials for solar energy applications." Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-144908.

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In line with The Paris Agreement, the world is now changing towards more sustainable options for all sorts of energy development. The solar energy sector is growing rapidly as a result of this. One area that holds great potential in changing many of the worlds heating processes, is concentrating solar power (CSP). The basic principle of CSP is to reflect incoming sunlight and concen- trate it to heat a fluid. To do so, it is crucial to find a reflector material that shows both good optical performance initially as well as over time to produce heat in the most efficient way possible and compete

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31

CARVALHO, SERGIO ANTENOR DE. "OPTICAL SYNTHESIS OF DUAL REFLECTOR FEED BY DIELETRIC HORN." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1991. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9249@1.

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A síntese de duplos refletores com um alimentador dielétrico é estudada sob as considerações da ótica geométrica. A análise ótica do problema leva a uma equação diferencial parcial não-linear de 2ª ordem do tipo Monge- Ampére. Soluções particulares desta equação, as geometrias Cassegrain e Gregoriana off-set, são apresentadas e estudadas. Estas são usadas como soluções iniciais no processo iterativo de síntese.<br>The synthesis of offset dual reflectors with dieletric feed is studied under the assumptions of geometrical optics. The optical analysis leads to a nonlinear second- order

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32

Wing, Christopher (Christopher John). "Bragg reflector geometries for colorimetric orientation and deformation sensing." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104295.

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Thesis: Nav. E., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.<br>Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 49).<br>Propulsion systems of commercial and naval ships are typically large and expensive. They must be kept well-aligned and free of corrosion to efficiently and reliably transfer torque to a ship's propeller. Early identification of misalignment or surface corrosion is therefore crucial, making an easily deplo

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33

Harun, Mahmud. "Modification of Large Reflector Antennas for Low Frequency Operation." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/29455.

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Modifications of large reflector antennas, such that their observing capabilities are enhanced in the range of about 10-500~MHz without affecting operation of the pre-existing higher-frequency systems, are addressed in this dissertation. The major contributions of this dissertation can be divided into two parts: 1) designing new low frequency feeds, and 2) developing new analysis methodologies which, as opposed to traditional techniques, are suitable for analyzing low frequency systems. First, we consider the performance of existing schemes that provide low frequency capability. Then, a new

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34

Lee, Teh-Hong. "A new approach for shaping of dual-reflector antennas /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487327695623512.

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35

LaPean, James William. "Beam scanning offset Casegrain reflector antennas by subreflector movement." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06302009-040304/.

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36

Liu, Yu. "Plasmonic Bragg reflector and its application on optical switching." [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1468113.

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37

Xu, Shenheng. "Optimization and compensation techniques for modern reflector antenna designs." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1973590611&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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38

Wong, Yau. "Geometric analysis of reflector systems for solar cell modules." Thesis, The University of Sydney, 1988. https://hdl.handle.net/2123/26247.

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This thesis is a study of the design, analysis and experimentation, of developing a feasible solar cell collector module, which in turn, can improve the output performance of a solar cell. The ﬁrst Chapter is devoted to deﬁning the background, structure and abilities of a solar cell, and to illustrating the long—term attraction to utilising solar energy. The extent of solar energy falling on earth in relation to its orientation with the earth is treated in Chapter two. Chapter three deals with various stages of module development and analysis; Chapter four illustrates the module experiment

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39

Maysami, Mohammad, and Felix J. Herrmann. "Seismic reflector characterization by a multiscale detection-estimation method." European Association of Geoscientists & Engineers, 2007. http://hdl.handle.net/2429/553.

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Seismic transitions of the subsurface are typically considered as zero-order singularities (step functions). According to this model, the conventional deconvolution problem aims at recovering the seismic reflectivity as a sparse spike train. However, recent multiscale analysis on sedimentary records revealed the existence of accumulations of varying order singularities in the subsurface, which give rise to fractional-order discontinuities. This observation not only calls for a richer class of seismic reflection waveforms, but it also requires a different methodology to detect and charact

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40

Sikström, Johannes. "Vibro-acoustic analysis of a satellite reflector antenna using FEM." Thesis, Umeå universitet, Institutionen för fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-39875.

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The acoustic environment generated during launch is the most demanding structural load case for large, lightweight satellite reflector antennas. The reflector is exposed to extremely high sound pressure levels originating from the structural excitation of the rocket engines and exterior air flow turbulence. This thesis aims to predict the structural responses in the reflector due to the acoustic pressure load with a model based on Finite Element Modelling (FEM). The FE-model is validated against a previously performed Boundary Element Method (BEM) analysis. An approach called Split Loading tog

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41

Duggan, Jason. "Adaptive beamforming with a focal-fed offset parabolic reflector antenna." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq20630.pdf.

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42

Yun, Han. "Design and characterization of a dumbbell micro-ring resonator reflector." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44535.

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A dumbbell shape micro-ring resonator reflector fabricated using the silicon-on-insulator (SOI) technology for use as a reflective notch filter is presented. The development of this dumbbell micro-ring reflector is motivated by the increasing demand for highly confined resonant structures as integrated optical components in modern optical communication and sensor applications. In this thesis, we have analyzed and simulated the reflection properties of dumbbell micro-ring reflectors based on SOI strip waveguides. We have optimized our design based on the analytic modeling and simulation results

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43

Lee, C. K. "Modelling and design of frequency selective surfaces for reflector antennas." Thesis, University of Kent, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376318.

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44

COSTA, LUISENRIQUE PIERRE NUNES DA. "APPLICATION OF SUCCESS OF PROJECTION USE SYNTHESIS OF REFLECTOR ANTENNAS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1994. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8956@1.

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TELECOMUNICAÇÕES BRASILEIRAS S/A<br>O modelamento de superfícies refletoras embarcadas em satélites tem se apresentado como uma alternativa eficiente à síntese de conjuntos de alimentadores. Existem várias técnicas disponíveis para a determinação do formato adequado para esta superfície, baseados em aproximações da ótica geométrica ou da ótica física. Neste trabalho, estudamos a aplicação da técnica das Projeções Sucessivas, um método interativo genérico, à síntese de superfície refletora e à síntese da distribuição de fase sobre a abertura. Este método é baseado nas aproximações da Ó

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45

Remaggi, Luca. "Acoustic reflector localisation for blind source separation and spatial audio." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/842217/.

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From a physical point of view, sound is classically defined by wave functions. Like every other physical model based on waves, during its propagation, it interacts with the obstacles it encounters. These interactions result in reflections of the main signal that can be defined as either being supportive or interfering. In the signal processing research field, it is, therefore, important to identify these reflections, in order to either exploit or avoid them, respectively. The main contribution of this thesis focuses on the acoustic reflector localisation. Four novel methods are proposed: a met

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46

Su, Nan-Ching, and 蘇楠清. "Fabricaton of the micro-reflector with total reflection." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/45709350399815530252.

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碩士<br>淡江大學<br>機械與機電工程學系碩士班<br>94<br>In this thesis, the Si mold containing inverted pyramid patterns with 54.74 degree between {111} planes and (100) plane was manufactured by photolithography process and Si (100) was prepared with KOH etching process for the anisotropic wet etching process. The polydimethylsiloxane was used to reprinted the structure of the si mold. Because polydimethylsiloxane was elongated easily, polydimethylsiloxane was forced to elongate single-axially to change the degree of the angle between {111} planes and (100) plane and the dimension of the structure. By using UV c

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47

Mousari, Bafrooei Seyed Pedram. "Reflector feeds for large adaptive reflector antennas." 2000. http://hdl.handle.net/1993/1840.

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A novel Feed-Reflector system for large Cassegrain antennas for Radio Astronomy and Deep-Space Communication applications is investigated. This Feed-Reflector is used to illuminate a hyperboloid sub-reflector with 5-10 m diameter located 500 m above the ground. Because the sub-reflector is located in the near field of the Feed-Reflector antenna, a theory based on the near field focusing properties of paraboloid reflectors is established. The focusing at near distance is formed by moving the feed horn away from the focal point of the Feed-Reflector. In this theory the properties of axial defocu

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48

Loewen, Nathan. "Conceptual design of reflector structure for the large adaptive reflector." Thesis, 2003. http://hdl.handle.net/2429/14484.

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The Large Adaptive Reflector (LAR) is a very large radio telescope proposed by the Dominion Radio and Astrophysical Observatory in Penticton, B C . Two innovative components make the L A R unique from traditional radio telescopes. Firstly, the focal receiver is supported by an airborne helium balloon. The position of the focal receiver is controlled by multiple tethers running to the ground. Secondly, the ground-based reflector structure is "adaptive" in nature, which allows it to be configured in a continuous range of parabolic shapes. The reflector structure is required to be 300m in

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49

Santos, Mafalda Ho de Almeida. "Inflatable Reflector Antenna." Master's thesis, 2021. https://hdl.handle.net/10216/135756.

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Abstract:

SARIA (Radar de Abertura Sintética usando uma Antena Insuflável) é uma experiência selecionada para voar num balão estratosférico, no âmbito do programa REXUS/BEXUS ciclo 13, e utilizará uma antena insuflável, operando a 5.8 GHz, para criar imagens de radar de abertura sintética (SAR). Vários problemas, como a seleção de material, impediram a SARIA de desenvolver uma antena insuflável operacional. O objetivo desta dissertação é projetar e implementar uma antena parabólica refletora insuflável, a 5.8 GHz, com um diâmetro de 1 m, bem como controlar a pressão da antena insuflável usando um sistem

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50

Santos, Mafalda Ho de Almeida. "Inflatable Reflector Antenna." Dissertação, 2021. https://hdl.handle.net/10216/135756.

Full text

Abstract:

SARIA (Radar de Abertura Sintética usando uma Antena Insuflável) é uma experiência selecionada para voar num balão estratosférico, no âmbito do programa REXUS/BEXUS ciclo 13, e utilizará uma antena insuflável, operando a 5.8 GHz, para criar imagens de radar de abertura sintética (SAR). Vários problemas, como a seleção de material, impediram a SARIA de desenvolver uma antena insuflável operacional. O objetivo desta dissertação é projetar e implementar uma antena parabólica refletora insuflável, a 5.8 GHz, com um diâmetro de 1 m, bem como controlar a pressão da antena insuflável usando um sistem

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