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Dissertations / Theses on the topic 'Aperture antennas'

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Published: 4 June 2021

Last updated: 20 February 2023

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1

Kujiraoka, Scott R., and Vries James M. De. "REDUCED APERTURE MICROSTRIP ANTENNAS FOR AIRBORNE VEHICLES." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607353.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>The available space for the mounting of antennas on missiles and airborne targets is very limited. The vehicle integrator is constantly striving for smaller antenna apertures while requiring increased performance. Microstrip antennas with moderate dielectric loading have been successfully utilized in the past to meet these requirements. With the advent of high dielectric substrate materials, the designer now has the option of further reducing

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2

Zivanovic, Bojana. "Series-Fed Aperture-Coupled Microstrip Antennas and Arrays." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4425.

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The focus of this dissertation is on the development and circuit modeling of planar series-fed, linear- and circular-polarized microstrip aperture-coupled antennas and N-element arrays operating in C-band. These arrays were designed to be used as part of airborne or land-based frequency-hopped communication systems. One of the main objectives of this work was to maintain a constant beam angle over the frequency band of operation. In order to achieve constant beam pointing versus frequency, an anti-symmetric series-fed approach using lumped-element circuit models was developed. This series feed

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3

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

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

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4

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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5

Zhang, Tieren. "Applications of microwave holography to the assessment of antennas and antenna arrays." Thesis, View thesis, 2001. http://handle.uws.edu.au:8081/1959.7/770.

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

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6

Zhang, Tieren. "Applications of microwave holography to the assessment of antennas and antenna arrays." View thesis, 2001. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20040330.103805/index.html.

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Thesis (Ph.D.) -- University of Western Sydney, 2001.<br>"Submitted in fulfilment of requirements for the degree of Doctor of Philosophy, School of Engineering and Industrial Design, University of Western Sydney" Includes bibliography.

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7

Arakaki, Dean Yasuo. "A reciprocity approach for analyzing radiation from aperture and nicrostrip antennas." Adobe Acrobat reader required to view the full dissertation, 2000. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-21/index.html.

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8

Robinson, Bryan. "Mathematical modelling of aperture coupled patch antennas with multi-layered superstrates." Thesis, Northumbria University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245239.

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9

Monkevich, James Matthew. "Analysis of Aperture Radiation Using Computer Visualization and Image-Processing Techniques." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36735.

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In order to accurately describe the behavior of an antenna, one needs to understand the radiation mechanisms that govern its operation. One way to gain such an insight is to view the fields and currents present on a radiating structure. Unfortunately, in close proximity to an antenna empirical techniques fail because the measurement probe alters the operation of the radiating structure. Computational methods offer a solution to this problem. By simulating the operation of an antenna, one can obtain electromagnetic field data near (or even internal to)

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10

Ozdemir, Caner. "Synthetic aperture radar algorithms for imaging antenna-platform scattering /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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11

Teniou, Mounir. "Metasurface antennas for space applications." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066281/document.

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Dans ce rapport, une méthode pour l'implémentation de distributions de champ arbitraires utilisant des metasurfaces tensorielles est présentée. Les metasurfaces modulées sinusoïdalement sont utilisées afin de générer des ondes de fuite avec un contrôle de l'amplitude et de la phase. La distribution de phase du champ d'ouverture désirée est obtenue en utilisant une nouvelle formulation locale du principe de l'holographie. D'autre part, la distribution d'amplitude est contrôlée en faisant varier les indices de modulations ainsi que l'impédance moyenne en fonction de la position. Un contrôle indé

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12

Biswas, Mahmud. "An Aperture Synthesis Technique for Cylindrical Printed Lens/Transmitarray Antennas with Shaped Beams." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24262.

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Printed lens antennas offer the possibility of realizing shaped beam patterns using no more complexity than is required for pencil beam patterns. Shaped beam patterns can be obtained by appropriately determining the complex transmission coefficient required for each cell (or element) of the printed lens, taking into account the varying feed field over the input surface of the lens. Certain ranges of transmission coefficient amplitude and phase are undesirable (eg. too low an amplitude implies a large reflection at the lens input surface). It would be preferable to constrain the range of values

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13

Baek, Seung Hoon. "STUDY OF MULTI- AND BROAD-BAND INTERNAL ANTENNAS FOR MOBILE APPLICATIONS." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/dissertations/424.

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The modified aperture coupled MicroStrip Antenna (MSA) and Planar Inverted F Antenna (PIFA) for mobile applications are studied and presented in this dissertation. The designed antennas are improved multi-band and broad-band characteristics by the modification of radiating elements and/or the ground plane. The novel modified aperture coupling annular-ring antenna fed by stripline is the hybrid structure of the aperture coupling feed MSA and the proximity feed MSA. The proximity feed enable to concentrate the field strength toward the direction of the radiating element and the modified aperture

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14

Cuiñas, Gómez Íñigo, Luis Landesa, and Pino Marcos Rodríguez. "Using wavelets in applied electromagnetics : an algorithm for efficient pattern synthesis of linear aperture antennas." Pontificia Universidad Católica del Perú, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/97009.

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Pattern synthesis of linear aperture antennas is a classical problem in Applied Electromagnetics with a great number of resolving methods. In this paper, a new algorithm that uses wavelets to compute the solution is presented. The new method reaches a good approximation of the aperture field from the antenna radiation pattern, using the Haar wavelet basis. Results prove the performance of the proposed method.

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15

Chim, Kwok Chi. "Investigating the impact of smart antenna on SAR /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202002%20CHIM.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2002.<br>Includes bibliographical references (leaves 53-54). Also available in electronic version. Access restricted to campus users.

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16

Iseri, Kadir. "Analysis Of Dual-polarized Aperture-coupled Microstrip Antennas With H-shaped Slots And Equivalent Circuit Modeling Of H-shaped Slots." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614527/index.pdf.

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This thesis includes the design, production and measurement of a wideband dualpolarized X-band aperture-coupled microstrip patch antenna. The wideband and dual-polarized operation is achieved through the use of H-shaped coupling slots. Therefore, the equivalent circuit modeling of a microstrip line fed H-shaped slot is also studied in this thesis. A step-by-step procedure is followed during the design process of the dual-polarized aperture-coupled microstrip antenna. First, an aperture-coupled microstrip antenna with a single rectangular slot, that exhibits a wideband characteristic for single

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17

Charland, Shawn Carleton University Dissertation Engineering Electrical. "An investigation of the extent of the fresnel region of aperture antennas with attention to superdirectivity." Ottawa, 1985.

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18

Abdel-Rahman, Mohamed A. "Numerical Reconstruction and Applications of Acoustic and Electromagnetic Ultra-Wideband Localized Pulses Generated by Dynamic Aperture Antennas." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/26335.

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A study is undertaken of the numerical reconstruction of acoustic and electromagnetic (EM) localized waves (LWs). The latter are carrier-free ultra-wideband pulses characterized by large focusing depths and extended ranges of localization. Special emphasis is placed on finite energy LWs that can be generated by dynamic aperture antennas with independently addressable elements. The reconstruction techniques are based on Huygens and Rayleigh-Sommerfeld integral I and II representations, both in the time and frequency domains. In contradistinction to the Weyl representation,they lend themselves t

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19

Okuducu, Yusuf. "Dual Band Microstrip Patch Antenna Structures." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606859/index.pdf.

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Wideband and dual band stacked microstrip patch antennas are investigated for the new wideband and dual band applications in the area of telecommunications. In this thesis, aperture-coupled stacked patch antennas are used to increase the bandwidth of the microstrip patch antenna. By this technique, antennas with 51% bandwidth at 6.1 GHz and 43% bandwidth at 8 GHz satisfying S11&lt<br>-15 dB are designed, manufactured and measured. A dual-band aperture coupled stacked microstrip patch antenna operating at 1.8 GHz with 3.8% bandwidth and at 2.4 GHz with 1.6% bandwidth is designed, produced and m

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20

Kwinana, Phumezo M. "A T-resonator technique for aperture plane admittance parameters of electrically short RF monopoles." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/1501.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.<br>This thesis focuses on the coaxial-microstrip T-resonator measurement technique to determine the aperture plane capacitance and radiation resistance of electrically short monopoles above a finite ground plane at Radio Frequencies. The determination of these impedance parameters is of interest as they are needed in the Thévenin equivalent circuit of the monopole to establish the relationship between the monopole, the electromagnetic field within which it is immersed, and its surrounding medium pr

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21

Kacar, Merve. "Direct Digital Manufacturing of Multi-layer Wideband Ku-band Patch Antennas." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7411.

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Design and performance of fully-printed Ku-band aperture coupled patch antennas fabricated by a direct digital manufacturing (DDM) approach that integrates fused deposition modeling (FDM) of acrylonitrile butadiene styrene (ABS) thermoplastic with in-situ micro-dispensing of conductive silver paste (CB028) are reported. Microstrip line characterizations are performed and demonstrate that misalignment of ABS substrate deposition direction with microstrip line micro-dispensing direction can degrade the effective conductivity up to 60% within the Ku-band, and must be taken int

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22

Gagnon, Nicolas. "Phase Shifting Surface (PSS) and Phase and Amplitude Shifting Surface (PASS) for Microwave Applications." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19826.

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This thesis describes an electrically thin surface used for electromagnetic applications in the microwave regime. The surface is free-standing and its primary purpose is to modify the phase distribution, or the phase and amplitude distribution of electromagnetic fields propagating through it: it is called phase shifting surface (PSS) in the first case, and phase and amplitude shifting surface (PASS) in the second case. For practical applications, the surface typically comprises three or four layers of metallic patterns spaced by dielectric layers. The patterns of the metallic layers are design

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23

Jacmenovic, Dennis, and dennis_jacman@yahoo com au. "Optimisation of Active Microstrip Patch Antennas." RMIT University. Electrical and Computer Engineering, 2004. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20060307.144507.

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This thesis presents a study of impedance optimisation of active microstrip patch antennas to multiple frequency points. A single layered aperture coupled microstrip patch antenna has been optimised to match the source reflection coefficient of a transistor in designing an active antenna. The active aperture coupled microstrip patch antenna was optimised to satisfy Global Positioning System (GPS) frequency specifications. A rudimentary aperture coupled microstrip patch antenna consists of a rectangular antenna element etched on the top surface of two dielectric substrates. The substrates

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24

Elmegri, Fauzi O. M. "Model and design of small compact dielectric resonator and printed antennas for wireless communications applications : model and simulation of dialectric resonator (DR) and printed antennas for wireless applications : investigations of dual band and wideband responses including antenna radiation performance and antenna design optimization using parametric studies." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14742.

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Dielectric resonator antenna (DRA) technologies are applicable to a wide variety of mobile wireless communication systems. The principal energy loss mechanism for this type of antenna is the dielectric loss, and then using modern ceramic materials, this may be very low. These antennas are typically of small size, with a high radiation efficiency, often above 95%; they deliver wide bandwidths, and possess a high power handling capability. The principal objectives of this thesis are to investigate and design DRA for low profile personal and nomadic communications applications for a wide variety

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25

Elmegri, Fauzi. "Model and design of small compact dielectric resonator and printed antennas for wireless communications applications. Model and simulation of dialectric resonator (DR) and printed antennas for wireless applications; investigations of dual band and wideband responses including antenna radiation performance and antenna design optimization using parametric studies." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14742.

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Dielectric resonator antenna (DRA) technologies are applicable to a wide variety of mobile wireless communication systems. The principal energy loss mechanism for this type of antenna is the dielectric loss, and then using modern ceramic materials, this may be very low. These antennas are typically of small size, with a high radiation efficiency, often above 95%; they deliver wide bandwidths, and possess a high power handling capability. The principal objectives of this thesis are to investigate and design DRA for low profile personal and nomadic communications applications for a wide v

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26

Goksu, Mesut. "Analysis Of Slot Coupled Patch Antennas Using Closed Form Green." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610996/index.pdf.

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In this thesis, an analysis technique for the slot coupled patch antennas using MoM in conjunction with the closed form Green&rsquo<br>s functions is presented. Slot coupled patch antennas are fed by a microstrip open stub which is coupled to the patch through an electrically small slot. Current distributions over the microstrip line, slot line and the patch are represented by rooftop basis functions. First, a relatively simple structure, microstrip coupled slot line is investigated using the proposed technique. Then the method is extended to the slot coupled patch antenna geometry. By using t

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27

Alam, Muhammad Faiz, and Muhammad Faiz Alam. "Dielectric Resonator Antennas (DRA) for satellite and body area network applications." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00795292.

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Technologies such as direct broad cast satellite system (DBSS), Geosynchronous Earth Orbit (GEO) and Low Earth Orbit (LEO) satellite communications , global positioning system (GPS), high accuracy airborne navigation system and a large variety of radar systems demand for high level of antenna performance. Similar is the requirement for upcoming land based wireless systems such as cellular and indoor communication systems that is needed some more specific and additional features added to the antenna to compensate for the deficiencies encountered in system's performance. Though metallic antennas

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28

Iliopoulos, Ioannis. "Engineering the near field of radiating systems at millimeter waves : from theory to applications." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S165.

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L'objectif général est de développer un nouvel outil numérique dédié à la focalisation en 3D de l'énergie en zone de champ très proche par un système antennaire. Cet outil permettra de définir la distribution spatiale complexe des champs dans l'ouverture rayonnante afin de focaliser l'énergie sur un volume quelconque en zone de champ réactif. L'hybridation de cet outil avec un code de calcul dédié à l'analyse rapide d‘antennes SIW par la méthode des moments permettra de synthétiser une antenne SIW ad-hoc. Les structures antennaires sélectionnées seront planaires comme par exemple les antennes

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29

Alam, Muhammad Faiz. "Dielectric Resonator Antennas (DRA) for satellite and body area network applications." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1057/document.

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Dans cette thèse, on vise deux types d'applications de l’antenne à résonateur diélectrique (DRA): 1) La réalisation d’un élément rayonnant pour un réseau phasé embarqué sur un véhicule terrestre ou un avion. Cet élément de base requiert une couverture en élévation supérieure à celle des éléments imprimés pour permettre une poursuite typique comprise entre ±70°. La couverture dans un cône large est assurée avec une bonne pureté de polarisation circulaire en alimentant l’antenne à travers deux ouvertures à fente en H orthogonales parfaitement découplées en bande X. 2) La deuxième structure est d

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30

Gosal, Gurpreet Singh. "The use of Inverse Neural Networks in the Fast Design of Printed Lens Antennas." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32249.

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In this thesis the major objective is the implementation of the inverse neural network concept in the design of printed lens (transmitarray) antenna. As it is computationally extensive to perform full-wave simulations for entire transmitarray structure and thereafter perform optimization, the idea is to generate a design database assuming that a unit cell of the transmitarray is situated inside a 2D infinite periodic structure. This way we generate a design database of transmission coefficient by varying the unit cell parameters. Since, for the actual design, we need dimensions for each cell o

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31

Gardenier, Peter H. "Antenna aperture phase retrieval." Thesis, University of Canterbury. Electrical and Electronic Engineering, 1990. http://hdl.handle.net/10092/6028.

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Geometrical defects of a high gain reflector antenna can cause the radiation pattern of the antenna to fail to meet its specifications. These defects give rise to loss of gain, widening of the main beam and raising of sidelobes. The geometrical defects can be identified, and subsequently corrected, by utilizing information contained in the phase of the copolar aperture field distribution. For technical reasons, this phase can be difficult or inconvenient to measure directly. Therefore, indirect methods of deducing the phase are often preferred. This thesis introduces an iterative algorithm,

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32

Ventas, Muñoz de Lucas Jesus. "Active- integrated aperture lens antenna." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-303003.

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Luneburg lens antennas are gaining popularity in new communication systems, as increasingly higher frequencies are being used. Broadband fully- metallic implementations of Luneburg lenses, such as Rinehart- Luneburg lenses, constitute simple, cheap and efficient beamformers. However, Luneburg lenses need to have one amplifier per port, which constrains the maximum power that can be transmitted and increases the cost of the system. In this thesis, an investigation to integrate amplifiers within the aperture of Luneburg lenses is conducted. This concept allows for increasing the maximum transmit

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33

Civerolo, Michael Paul. "Aperture Coupled Microstrip Antenna Design and Analysis." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/300.

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A linearly-polarized aperture coupled patch antenna design is characterized and optimized using HFSS antenna simulation software. This thesis focuses on the aperture coupled patch antenna due to the lack of fabrication and tuning documentation for the design of this antenna and its usefulness in arrays and orthogonally polarized communications. The goal of this thesis is to explore dimension effects on aperture coupled antenna performance, to develop a design and tuning procedure, and to describe performance effects through electromagnetic principles. Antenna parameters examined in this study

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34

Ferland, Etienne. "Analysis and design of a synthetic aperture radar membrane antenna." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95659.

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Use of a membrane antenna on remote sensing satellites is now possible because of new materials and manufacturing technologies. This would allow space organizations to cut cost and weight by a non-negligible factor. All possible failure modes must be fully analyzed before these are sent to space. With membrane antennas, a new type of failure mode must be looked at: wrinkling. The wrinkling of the emitting layer could greatly undermine the performance of the antenna by modifying the orientation of the radiating elements rendering the wrinkle-affected area useless. It has been anticipated that s

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35

Baretela, Michael J. "Increasing prompt response from impulse radiating antenna by aperture shaping." Thesis, Monterey California. Naval Postgraduate School, 2002. http://hdl.handle.net/10945/6094.

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Approved for public release, distribution is unlimited<br>In order to improve the prompt response from an impulse radiating antenna (IRA)number of studies have suggested controlling the spatial distribution of the aperture fields by changing the feed arm angle. Other work has suggested that proper shaping of the aperture can further enhance the radiated signal for a given feed structure. This paper shows how the radiated prompt response can be maximized for a given feed arm configuration by shaping the aperture to eliminate fields orientated in the wrong direction. The percent increase in the

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36

Zubir, Farid. "Direct integration of push-pull amplifier and aperture coupled antenna." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6454/.

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The work described in this thesis concerns the integration of push-pull class B amplifier and antenna modules. Push-pull class B is well-known with its fruitful advantages of using differential feeding technique, resulting in low distortion, reasonably high efficiency and high output power. Meanwhile, the antenna module in this work is adapted from the aperture-coupled antenna structure due to its degree of freedom to control the variables which provide the best possible topology that could be realised in system on chip or system in package. More generally, the variables allow good coverage of

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Warrington, E. Michael. "Ionospheric radiowave propagation effects observed with a large aperture antenna array." Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/35817.

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The wavefronts of high frequency (HF) radio waves received after reflection from the ionosphere exhibit both spatial non-linearities and temporal variations which limit the performance of large aperture receiving arrays. The first objective of this investigation was to measure the phase and amplitude of ionospherically propagated signals at several widely spaced antennas in order to relate these parameters to the reflection process. From the amplitudes and phases measured at pairs of spaced antennas, the direction of arrival (DOA) of the signal in both azimuth and elevation was determined. Fur

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Guadiana, Juan, Fil Macias, and Chris Braun. "A Smarter Antenna." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595731.

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ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada<br>The Isotropic radiator, a device capable of radiating energy evenly in all directions is an abstraction, itsʼ real counterpart is called an omnidirectional (omni) antenna. The omnidirectional antenna is found on many vehicles. Ideally, only one receiving system is ever needed to acquire an omni, no matter the vehicle orientation, given the range is not excessive. There are trade-offs with antenna efficiency

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Albornoz, Navarro Daniel Alejandro. "Diseño y fabricación de un arreglo de antenas metamaterial alimentado mediante acoplamiento por apertura a 5.8 GHz en sustrato FR4." Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170701.

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Memoria para optar al título de Ingeniero Civil Eléctrico<br>En los últimos años ha existido un justificado interés en el desarrollo y aplicaciones de los metamateriales. Estos consisten en estructuras o materiales compuestos que pueden imitar respuestas de materiales conocidos o exhibir propiedades que no están disponibles en la naturaleza. Ser capaz modificar las propiedades de los metamateriales permite controlar su comportamiento a nivel electromagnético. En el diseño de antenas esto significa contar con herramientas adicionales para mejorar el desempeño, reducir el tamaño y abrir nue

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Rizzo, Carlo Anthony Edward. "Phase retrieval near-field/far-field measurement techniques for quasi-optical large apertures." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310888.

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Nafi, Kawser Wazed. "Application of Synthetic Aperture Radar with Wi-Fi for Indoor Localization." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34467.

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Indoor localization is the process of localizing people or objects inside a building in the same way GPS does in an outside environment. In recent years, researchers have successfully achieved improvement in indoor localization accuracy. Still there are many limitations to overcome in performing and achieving good accuracy in indoor localization. The interest in estimating the location of something inside a building with good accuracy is very strong. In this thesis we first propose an indoor localization technique relative to Wi-Fi access points along with a novel heuristic search based algori

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Vlasits, Tamas. "Modelling and application of a cross-aperture coupled single feed circularly polarised patch antenna." Thesis, Northumbria University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245262.

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Vinci, Joseph J. "Sparse Aperture Measurement in a Non-Ideal Semi-Anechoic Chamber." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1557426154482334.

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44

Křivák, Jiří. "Analysis of feeding techniques of a patch antenna array for 5G NR." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-449165.

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Tato diplomová práce se zabývá analízou různých napájecích struktur pro 2x2 flíčkové antenní pole. Evaluace probíhá na střední frekvenci 25.5GHz, která spadá do pásma přiřazeného páté generaci mobilních komunikačního standardu. Zvolené napájecí struktury byly napájení blízkým polem, napájení aperturou a napájení mikropáskem.

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Pelham, Timothy George. "Analysis of conformal antenna array design using beamforming methods and on-platform aperture modelling." Thesis, University of Bristol, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.738323.

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Bílek, Ondřej. "Flíčkový reflektor s elektronickým řízením směrové charakteristiky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316447.

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The diploma thesis is aimed to design, optimize, produce and subsequently measure the properties of the reflector with the electronic steering direction for the frequency of the 24,125 GHz band ISM. The problem chosen is solved by a group of voltage-controlled varicaps. The reflector consists of a matrix of two rows, each containing 3 cells. The reflector was designed by full-wave software CST Microwave Studio 2015.

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Pulipati, Sravan Kumar. "Electronically-Scanned Wideband Digital Aperture Antenna Arrays using Multi-Dimensional Space-Time Circuit-Network Resonance." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1499440141479455.

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Henrion, Stéphane. "Traitements SAR (Synthetic Aperture Radar) spatial très haute résolution." Toulouse, INPT, 2001. http://www.theses.fr/2001INPT050H.

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Le Radar à Synthèse d'Ouverture (RSO) est un instrument embarqué, utilisé en télédétection pour obtenir des images tout temps, toute heure de la surface terrestre. Les utilisations actuelles de ces images requièrent des résolutions métriques à sub-métriques. Alors que la résolution en site (transversale au déplacement du radar) est essentiellement limitée par la technologie (principe de compression d'impulsion), la réelle difficulté algorithmique de l'imagerie RSO tient dans l'obtention de la résolution azimutale, parallèle au déplacement du support, qui exploite les contributions successives

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Liu, Lei. "Investigation of aperture coupled microstrip antenna to obtain a high efficient active integrated antenna by using Class F and Inverse Class F power amplifiers." Thesis, Northumbria University, 2013. http://nrl.northumbria.ac.uk/21425/.

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In wireless communications and radar systems, there are requirements for high efficiency, small size, low cost, and wide bandwidth of transmitter front –end usage for commercial and also military applications. Active integrated antenna (AIA) could satisfy almost all the requirements. The overall objective of the proposed research is to model, optimise, and design a compact and high efficient AIA using an aperture coupled microstrip antenna (ACMA) by integrating with a power amplifier (PA). Research on ACMA has been focused on the transmissions line (TL) model (TLM) and full wave electromagneti

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Ashok, Amit. "Implementation and analysis of a bayesian approach to topographic reconstruction with multiple antenna synthetic aperture radar interferometry." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/5237.

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Bibliography: leaves 81-84.<br>Multiple-antenna synthetic aperture radar (SAR) interferometry is a single-pass interferometry technique for topographic mapping. A Bayesian model-base approach to topographic recontruction with multiple-antenna SAR interferomety, proposed by Dr. A. J. Wilkinson, is implemented and analysed in this dissertation.

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