Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design

Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design

Bibliographic Details
Main Author: Wainwright, Gregory David
Language:English
Published: The Ohio State University / OhioLINK 2015
Subjects:
Electrical Engineering
Electromagnetics
Dielectric Rod Antenna
Ultra-Wideband
Antenna Feed
probes
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1437566560
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu14375665602021-08-03T06:32:20Z Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design Wainwright, Gregory David Electrical Engineering Electromagnetics Dielectric Rod Antenna Ultra-Wideband Antenna Feed probes This dissertations focuses on the development of a novel Ultra-Wideband (UWB) circularly polarized dielectric rod antenna (CPDRA) which yields a constant gain, pattern, and phase center. These properties are important in many applications. Within radar systems a constant phase center is desirable to avoid errors within downrange and crossrange measurements. In a reflector antenna the illumination, spillover, and phase efficiencies will remain the same over an ultra-wideband. Lastly, near field probes require smooth amplitude and phase patterns over frequency to avoid errors during the calibration process of the antenna under test. In this dissertation a novel CP feeding network has been developed for an ultra-wideband dielectric rod antenna. Circularly-polarized antennas have a major advantage over its linearly-polarized counterpart in that the polarization mismatch loss caused by misalignment between the polarizations of the incident fields and antenna can be avoided. This is important in satellite communications and broadcasts where signal propagation through the ionosphere can experience Faraday Rotation. A circularly polarized antenna is also helpful in mobile radar and communication systems where the receiving antenna’s orientation is not fixed. Previous research on UWB dielectric rod antenna designs has focused on Dual linear feeds. Each polarization within the dual linear feed is excited by a pair of linear launcher arms fed with a 0<sup>0</sup>-180<sup>0</sup> hybrid balun. The proposed CPDRA design does not require the 0<sup>0</sup>-180<sup>0</sup> hybrid baluns or 0<sup>0</sup>-90<sup>0</sup> hybrid for achieving CP operation. These hybrids will increase the antenna’s size, weight, cost, and reduce operational bandwidth.A design technique has been developed for an UWB multilayer dielectric waveguide used in a CPDRA antenna. This design technique uses near-field Electric field data from inside the waveguide, in conjunction with a genetic algorithm optimization to yield a wideband waveguide with a near field amplitude distribution that scales with frequency.A multilayered dielectric waveguide presents many fabrication challenges. The thermal expansion rates, moisture absorption rates, and vibration properties differ within the various dielectric materials used. Therefore, the development of a wideband waveguide using one material with a low dielectric constant would be advantages since 3-D printing technology can be utilized. In this dissertation novel TE<sub>01</sub> and TM<sub>01</sub> mode suppressors have been developed using only a single dielectric material. 2015-10-15 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1437566560 http://rave.ohiolink.edu/etdc/view?acc_num=osu1437566560 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection NDLTD
language English
sources NDLTD
topic Electrical Engineering
Electromagnetics
Dielectric Rod Antenna
Ultra-Wideband
Antenna Feed
probes
spellingShingle Electrical Engineering
Electromagnetics
Dielectric Rod Antenna
Ultra-Wideband
Antenna Feed
probes
Wainwright, Gregory David
Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design
author Wainwright, Gregory David
author_facet Wainwright, Gregory David
author_sort Wainwright, Gregory David
title Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design
title_short Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design
title_full Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design
title_fullStr Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design
title_full_unstemmed Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design
title_sort development of an ultra-wideband circularly polarized multiple layer dielectric rod antenna design
publisher The Ohio State University / OhioLINK
publishDate 2015
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1437566560
work_keys_str_mv AT wainwrightgregorydavid developmentofanultrawidebandcircularlypolarizedmultiplelayerdielectricrodantennadesign
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