Compact ultra-wideband dielectric resonator antennas

UWB communication systems were newly regenerated when the Federal Communications Commission (FCC) defined the 3.1-10.6 GHz unlicensed band for UWB applications. Based on an investigation in designing UWB antennas, researchers have encountered more difficulties compared to a narrow band antenna. UWBa...

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Bibliographic Details
Main Author:	Kasgari, Mohammad Abedian
Format:	Thesis
Language:	English
Published:	2015
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/77722/1/MohammadAbedianKasgariPFKE2015.pdf
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id	my-utm-ep.77722
record_format	uketd_dc
spelling	my-utm-ep.777222018-06-29T21:45:09Z Compact ultra-wideband dielectric resonator antennas 2015-02 Kasgari, Mohammad Abedian TK Electrical engineering. Electronics Nuclear engineering UWB communication systems were newly regenerated when the Federal Communications Commission (FCC) defined the 3.1-10.6 GHz unlicensed band for UWB applications. Based on an investigation in designing UWB antennas, researchers have encountered more difficulties compared to a narrow band antenna. UWBantennas should have extremely wide impedance bandwidth while preserving high radiation efficiency with compact size. In some cases, a band-notched function should have been created to avoid electromagnetic interference between nearby existing systems and UWB systems. In this research, various promising UWB Dielectric Resonator Antennas (DRAs) have been demonstrated to overcome several challenges. The impedance bandwidth of the UWB DRAs has been improved for more than 110% by using some techniques such as connecting a strip to the ground plane and modifying structure of Dielectric Resonator (DR). The efficiency issue of UWB antennas is overcome by implementing DR as a resonator element which is excited by various shape structures feed lines to achieve more than 90% efficiency. The electromagnetic interferences between UWB systems and nearby existing systems in the frequency bands of 3.22-4.06 GHz, 4.84-5.96 GHz and 5.71-6.32 GHz are eliminated by using a stub connected to the hollow centre of feed line, an inverted-T shape parasitic strip near DR and modified metallic sheet underneath the DR, respectively. Compared with UWB monopole antennas, UWB DRAs obviate the problem of radiation pattern by utilizing dielectric resonator characteristics. In parallel, the broadside radiation pattern is obtained by implementing various shapes of microstrip feed line at a proper location to excite the DRA that provides symmetry radiation patterns with a consistent stability across the desired bandwidth. 2015-02 Thesis http://eprints.utm.my/id/eprint/77722/ http://eprints.utm.my/id/eprint/77722/1/MohammadAbedianKasgariPFKE2015.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:96767 phd doctoral Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Kasgari, Mohammad Abedian Compact ultra-wideband dielectric resonator antennas
description	UWB communication systems were newly regenerated when the Federal Communications Commission (FCC) defined the 3.1-10.6 GHz unlicensed band for UWB applications. Based on an investigation in designing UWB antennas, researchers have encountered more difficulties compared to a narrow band antenna. UWBantennas should have extremely wide impedance bandwidth while preserving high radiation efficiency with compact size. In some cases, a band-notched function should have been created to avoid electromagnetic interference between nearby existing systems and UWB systems. In this research, various promising UWB Dielectric Resonator Antennas (DRAs) have been demonstrated to overcome several challenges. The impedance bandwidth of the UWB DRAs has been improved for more than 110% by using some techniques such as connecting a strip to the ground plane and modifying structure of Dielectric Resonator (DR). The efficiency issue of UWB antennas is overcome by implementing DR as a resonator element which is excited by various shape structures feed lines to achieve more than 90% efficiency. The electromagnetic interferences between UWB systems and nearby existing systems in the frequency bands of 3.22-4.06 GHz, 4.84-5.96 GHz and 5.71-6.32 GHz are eliminated by using a stub connected to the hollow centre of feed line, an inverted-T shape parasitic strip near DR and modified metallic sheet underneath the DR, respectively. Compared with UWB monopole antennas, UWB DRAs obviate the problem of radiation pattern by utilizing dielectric resonator characteristics. In parallel, the broadside radiation pattern is obtained by implementing various shapes of microstrip feed line at a proper location to excite the DRA that provides symmetry radiation patterns with a consistent stability across the desired bandwidth.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Kasgari, Mohammad Abedian
author_facet	Kasgari, Mohammad Abedian
author_sort	Kasgari, Mohammad Abedian
title	Compact ultra-wideband dielectric resonator antennas
title_short	Compact ultra-wideband dielectric resonator antennas
title_full	Compact ultra-wideband dielectric resonator antennas
title_fullStr	Compact ultra-wideband dielectric resonator antennas
title_full_unstemmed	Compact ultra-wideband dielectric resonator antennas
title_sort	compact ultra-wideband dielectric resonator antennas
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2015
url	http://eprints.utm.my/id/eprint/77722/1/MohammadAbedianKasgariPFKE2015.pdf
_version_	1747817815665016832

Compact ultra-wideband dielectric resonator antennas

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