Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Reflectarray"”.
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Demonstrating Reflectarray Behavior At Infrared
Reflectarrays are traditionally passive, planar microstrip antenna devices designed for reflected phase manipulation at each individual antenna element making up the array. By varying the phase response across the surface with the antenna elements, reflectarrays allows a planar surface to exhibit …
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Pattern reconfigurable reflectarray for cubesat applications
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-12-01
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Reconfigurable reflectarray with a flexible ground plane
To view abstract please refer to PDF.
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Broadband Approaches And Beam-Scanning Techniques For Reflectarray Antenna
<p>Reflectarray antennas combine the numerous advantages of reflector antennas and phased array antennas and create a hybrid high-gain antenna with a low-profile, low-mass, easy-fabrication, and diversified radiation performance. However, it still has some inherent drawbacks, such as limited …
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Advanced Design Methodologies and Novel Applications of Reflectarray Antennas
Reflectarray antennas combine the numerous advantages of printed antenna arrays and reflector antennas and create a hybrid high-gain antenna with a low-profile, low-mass, and diversified radiation performance. Reflectarrays are now emerging as the new generation of high-gain antennas for …
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Towards High-Performance Reflectarray Antennas: Phase Sensitivity Reduction for Wide Bandwidth
Reflectarray antennas are gaining popularity in satellite and communication systems due to their high gain and lightweight design. However, their limited bandwidth poses a significant challenge because phase behavior varies across different frequencies. This thesis aims to address this limitation …
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Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials
… mechanical movement an electronically tunable reflectarray antenna based on non-homogeneous properties of substrate materials has been introduced. This research study provides a thorough investigation on the tunability performance of reflectarrays designed in X-band frequency range. The …
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Beam-Steerable and Reconfigurable Reflectarray Antennas for High Gain Space Applications
Reflectarray antennas uniquely combine the advantages of parabolic reflectors and phased array antennas. Comprised of planar structures similar to phased arrays and utilizing quasi-optical excitation similar to parabolic reflectors, reflectarray antennas provide beam steering without the need of …
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Design of reflectarray antenna integrated with FSS textured configurations for wireless communication applications
… investigates the feasibility of employing reflectarray antenna integrated with FSS textured configurations to combat the scan blindness problem. Performance investigation of different strategic resonant elements has been carried out in X-band frequency range by using commercially available …
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Predicting Tolerance Effects on The Radiation Pattern of Reflectarray Antennas Through Interval Analysis
… tolerance effects on the radiation pattern of reflectarray antennas through Interval Analysis. In fact, the uncertainty on the actual size of all parameters under fabrication tolerates such as element dimensions and dielectric properties, are modeled with interval values. Afterwards, the rules …
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Single-band and Dual-band Beam Switching Systems and Offset-fed Beam Scanning Reflectarray
The reflectarray has been considered as a suitable candidate to replace the conventional parabolic reflectors because of its high-gain, low profile, and beam reconfiguration capability. Beam scanning capability and multi-band operation of the microstrip reflectarray have been main research topics …
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Development of Efficient Techniques for the Analysis and Design of Antennas in Dual-Reflectarray Configuration
… to the analysis and design of printed reflectarray antennas. The main part of the work is focused on the analysis of dual offset antennas comprising two reflectarray surfaces, one of them acts as sub-reflector and the second one acts as mainreflector. These configurations introduce …
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Multi-Layered Dual-Band Dual-Polarized Reflectarray Design Toward Rim-Located Reconfigurabable Reflectarrays for Interference Mitigation in Reflector Antennas
… observations. This thesis introduces reflectarray design which can serve as a basis for an interference mitigation solution for radio telescopes. In the envisioned application, When the reflectarray is placed around the circumference of an existing radio telescope, it can drive a null …
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Advanced techniques for the analysis and synthesis of reflectarray antennas with applications in near and for fields
… de nuevas técnicas de análisis y síntesis de reflectarrays. Se pretende prestar especial atención a la eficiencia de dichas técnicas. En particular, las nuevas técnicas de análisis se centran en el desarrollo de algoritmos precisos y rápidos para el cálculo de diagramas de radiación, basadas …
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Reflectarray Antenna based FMCW Radar System Development: High Isolation Radar Antenna Design and Feasibility of Affordable Switched-Beam for the UAV Detection
… the low power and high gain requirements. The reflectarray antenna technique was chosen for this purpose due to its lightweight, foldable and high gain boosting capability. This study first introduced a conventional centered reflectarray antenna using a numerical modeling technique based on …
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Design optimization of broadband rape-based reflectary antena elements for x-band applications
… analysis, design and optimization of broadband reflectarray antenna elements embedded on organic substrate materials. It addresses the key limitations of microstrip reflectarray antenna technology i.e., narrow bandwidth and high loss performance. It presents a novel dual resonance element with …
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Design of Ultra-wideband Reflectors
It is well-known that reflectarrays typically have a narrow bandwidth which is commonly attributed to the resonant nature of the antenna elements used and the narrow bandwidth of the phase shifting networks used. Typical approaches to increase the bandwidth include the use of true-time-delay (TTD) …
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Development of switchable planar reflectors for beam shaping realization
… configurations for an efficient reconfigurable reflectarray antenna design. PIN diodes were incorporated with single and multiple slot embedded patch element configurations for the design of beam switchable planar reflectors. Moreover unit cells based on liquid crystal substrates were also …
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Rim-Mounted Reconfigurable Surfaces for Interference Nulling in Focus-Fed Axisymmetric Reflector Antenna Systems
… for radio astronomy applications. The ERS is a reflectarray that consists of multiple elements, which can be electronically controlled to modify the reflected field. Previous research focused on a "conformal" system with elements placed on a parabololoidal surface extending beyond the unmodified …
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Ultra-Miniaturized, Secure Wake-Up Receiver Based on THz Carrier Wave
… meters and paired with a beam-steerable THz reflectarray, demonstrating its potential for real-world applicability.
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