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 14 of 14 for “"spiral antenna"”.
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The Equiangular Spiral Antenna
Made available in DSpace on 2014-12-04T21:02:59Z (GMT). No. of bitstreams: 1 0025214.pdf: 4973193 bytes, checksum: fe846796c713e9a79934008f006ec2cc (MD5) Previous issue date: 1957
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A Study of the Equiangular Spiral Antenna
Made available in DSpace on 2014-12-08T22:23:51Z (GMT). No. of bitstreams: 1 6604221.pdf: 1860979 bytes, checksum: ab11f1ae7d92ed6ed2c9f710bc8a04b3 (MD5) Previous issue date: 1965
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A Theoretical Study of the Equiangular Spiral Antenna
Made available in DSpace on 2014-12-04T21:03:05Z (GMT). No. of bitstreams: 1 5900541.pdf: 1805369 bytes, checksum: b058d5d7acd8d24c7833497f725b2094 (MD5) Previous issue date: 1958
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Archimedean spiral antenna embedded with frequency selective surface for wideband applications
… unidirectional radiation pattern and wideband antenna ranging from 3.1 GHz to 10.6 GHz. An Archimedean spiral antenna is the most potential candidate in the above mentioned applications as the antenna meets most of the above requirements. However, the practical implementation of spiral antenna …
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A deployable bottom fed conical log-spiral antenna for CubeSat applications
The requirements for deployable antenna systems on micro-satellites, specifically on the CubeSat platform, are ever changing. This thesis will address the possible antenna systems that would best be deployed on a CubeSat, with the major focus on the conical log-spiral antenna (CLSA) due to its …
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Design of an Ultra-Wideband Spiral Antenna for Ground-Penetrating Microwave Impulse Radar Applications
… Radar (MIR) capable of IED detection requires antennas capable of transmitting sub-nanosecond pulses over ultra-wideband (UWB) frequency ranges. This thesis investigates the suitability of a novel MIR antenna for high-accuracy ground-penetrating radar (GPR) applications. Key GPR antenna …
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Design and Analysis of Star Spiral with Application to Wideband Arrays with Variable Element Sizes
… dissertation details the development of the star spiral antenna and demonstrates the advantages of the star spiral when used in a wideband array with variable element sizes. The wideband array with variable element sizes (WAVES) is a multi-octave array that uses different sized circular …
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Design And Analysis Of Adaptive And Reconfigurable Antennas For Wireless Communication
… a tremendous increase in the number of antennas onboard, on the ground, and in orbital space. This places a burden due to the confined volume and limited weight requirements especially in space applications. The reconfigurable antenna is a promising and exciting new type of antenna, …
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A Study of Techniques to Solve the Disparate Mesh Size Problem With an Application to Sinuous Antennas
… multipole method (FMM) to a particular wideband antenna, the sinuous antenna. The essence of the problem is that a triangular patch mesh containing a wide range in patch sizes produces an ill-conditioned method of moments impedance matrix. Since the FMM algorithm relies on iterative solvers to …
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A characteristic mode perturbation approach for antenna loading design
Reactive loading is commonly applied to antennas to modify input impedance and radiation pattern properties. However, reactive loading design approaches based on experience, intuition, and modeling are challenged as the demand grows for antennas with increased functionality and performance. New …
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Reconfigurable phased microstrip antenna array with defected ground structure and defected microstrip structure for beam steering application
… to electronically steer the beam maximum of an antenna electric field pattern to some predefined point in space. The performance of a phased antenna array for beam steering without moving the antennas is important to military and civil applications. A steerable antenna with tunable phase shifter …
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Analysis and design of planar slot antennas for RFID applications using characteristic mode theory
… room and reads information from a passive tag antenna. These systems have been implemented in the LF (12 {13 KHz), HF (13 MHz), UHF (860 { 960 MHz) frequency bands. Most RFID tags in the LF and HF use simple loop variants to achieve magnetic coupling between the reader and the tag and have …
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Design and Implementation of System Components for Radio Frequency Based Asset Tracking Devices to Enhance Location Based Services. Study of angle of arrival techniques, effects of mutual coupling, design of an angle of arrival algorithm, design of a novel miniature reconfigurable antenna optimised for wireless communication systems
… is cost effective and efficient for 3, 4, and 5 antenna array elements. This research also considers the shape of the ground plane and its effects on the angle of arrival estimation and in addition it shows how the mutual couplings between the elements effect the overall estimation and how this …
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Investigation, design and implementation of circular-polarised antennas for satellite mobile handset and wireless communications. Simulation and measurement of microstrip patch and wire antennas for handheld satellite mobile handsets and investigations of polarization polarity, specific absorption rate, and antenna design optimization using genetic algorithms.
… design and implement circularly-polarized antennas to be used for handheld satellite mobile communication and wireless sensor networks. Several antennas such as Quadrifilar Spiral Antennas (QSAs), two arm Square Spiral and stripline or coaxially-fed microstrip patch antennas are developed …