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 85 for “"Antenna design"”.
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An innovative antenna design tool : the antenna design software
Antenna design starts with a desired electrical performance, stating the minimum gain, beamwidth and/or other parameters, across a specified bandwidth. An antenna type is chosen, and then trial-and-error is used to choose the dimensions. An initial set of dimensions is used to find the antenna's …
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Critical Analysis Of Transmitarray Antenna Design
In recent years, transmitarray antenna concept attracts growing interests of many scientists in the antenna area. It combines the favorable features of the lens antenna that are based on optical theory and the microstrip arrays that are based on array theory, leading to a low profile design with …
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Integrated reflector antenna design and analysis
Reflector antenna design is a mature field and most aspects of it have been studied. However, most previous work is distinguished by the fact that it is narrow in scope, analyzing only a particular problem under certain conditions. Methods of analysis of this type are not useful for working on …
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Antenna design for ultra wideband radio
… of exciting opportunities and challenges for design in the communications arena, including antenna design. Ultra Wideband Radio requires operating bandwidths up to greater than 100% of the center frequency. Successful transmission and reception of an Ultra Wideband pulse that occupies the …
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Antenna design for 2.4 GHz ISM band
… A lot of research has been conducted on the design of antennas operating inside this band. The limited space on the circuit board for the RF module imposes a limit on the physical size available for the antenna. This thesis presents two types of antennas to explore possible ways to solving …
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GPR propagation simulation and fat dipole antenna design
… The first application is investigating how antennas propagate. reflect, and the difference in transmit and receive signals in various ground media. Results of the ground penetration simulations done in FEKO (MoM- Method of Moment) is compared to Finite Difference Time Domain (FDTD) results …
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Structural-Electromagnetic Simulation Coupling and Conformal Antenna Design Tool
… reconnaissance. Most airborne systems utilize antenna arrays that are installed inside the moldline of the aircraft or in radomes that protect the array from in-flight loads. While externally-mounted arrays can offer the advantage of larger apertures, sensor-vehicle interactions often result in …
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Machine Learning and Additive Manufacturing Based Antenna Design Techniques
… with the ultimate goal of tackling the universal antenna design challenges and achieving automated antenna design for a broad range of applications. First, we investigate the implementation and accuracy of few modern machine learning techniques including, least absolute shrinkage and selection …
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Coil antenna design for transmitter and receiver for bioelectronics
… This thesis shows an inductive link of the coil antenna designs that present a wireless power transfer system based on a near-field communication. The coil antennas contribute the electronics to receive power wirelessly and monitor the collected data continuously. Both coil antennas for the …
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NeXtRAD antenna design: X-Band dual polarised conical horn antenna
… purpose of the dissertation is to investigate a design and implementation of a dual polarised X-band antenna. The desired specifications include a centre frequency of 8.5 GHzand a 10_ azimuth-half power beam width in both vertical and horizontal polarisations. Other requirements include peak …
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Synthetic aperture radar-based techniques and reconfigurable antenna design for microwave imaging of layered structures
… microwave imaging systems require suitable antennas for signal transmission and data collection. A reconfigurable antenna which its characteristics can be dynamically changed provide significant flexibility in terms of beam-forming, reduction in unwanted noise and multiplicity of use …
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Antenna design using optimization techniques over various computaional electromagnetics. Antenna design structures using genetic algorithm, Particle Swarm and Firefly algorithms optimization methods applied on several electromagnetics numerical solutions and applications including antenna measurements and comparisons
… computation time, constraints put forward for antenna requirements and demand for large computer memory, are very common in the analysis due to the increased interests in tackling high-scale, more complex and higher-dimensional problems. On the other side, demands for even more accurate results …
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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
… 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 SDMoM. …
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Architecture and Design Considerations of Active Antennas on Space Based Platforms
The design of antennas for space-based applications requires that particular attention be paid to various requirements imposed on the design by the space environment. Additional requirements are driven by the platform on which the antenna will be hosted as well as by the intended use of the …
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Active Antenna Bandwidth Control Using Reconfigurable Antenna Elements
Reconfigurable antennas represent a recent innovation in antenna design that changes from classical fixed-form, fixed-function antennas to modifiable structures that can be adapted to fit the requirements of a time varying system. Advances in microwave semiconductor processing technologies have …
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Ultra-wideband antenna design for microwave imaging applications. Design, optimisation and development of ultra-wideband antennas for microwave near-field sensing tools, and study the matching and radiation purity of these antennas within near field environment.
… This thesis documents the development of antenna design for microwave imaging application such as breast cancer detection. The application is similar to the concept of Ground Penetrating Radar (GPR) but operating at higher frequency band. In these systems a short pulse is transmitted from …
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Fundamental Limits on Antenna Size for Frequency and Time Domain Applications
… becomes part of life, the demand on antenna miniaturization and interference reduction becomes more extreme. However, antenna size and performance are limited by radiation physics, not technology. In order to understand antenna radiation and energy storage mechanisms, classical and …
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Design, simulation, and analysis of reconfigurable antennas in GHz regime
… AUTHOR'S REQUEST.] This research focuses on the design and analysis of a reconfigurable antenna where the radiation pattern and its characteristics are altered in each operating state. Specifically three versions of the reconfigurable antenna have been designed, all made from the same materials. …
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Design and implementation of a dual polarised L-band parabolic dish antenna for NeXtRAD
… 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 …
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The Development of an Independent Frequency Modulated Continuous Wave Radar for Perimeter Security
… will eventually end up as independently user designed. The purpose of achieving the independent hardware design is pave the way for further hardware and software improvements without being hampered by the currently cumbersome and limited hardware setup. The achievement of an independent setup …
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