Bandwidth enhancement of spiral antenna with defected ground structure

In wireless communications systems, harmonics and unwanted frequency other than designed one becomes a dominant factor in limiting quality and capacity of transmitted or received signal. Rectangular spiral antenna (RSA) is designed in order to obtain the required parameter responses at 2.45 GHz for...

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Main Author:	Mohamed, Mohamed Osman
Format:	Thesis
Language:	English English English
Published:	2018
Subjects:	TK Electrical engineering Electronics Nuclear engineering TK7800-8360 Electronics
Online Access:	http://eprints.uthm.edu.my/7825/1/24p%20MOHAMED%20OSMAN%20MOHAMED.pdf http://eprints.uthm.edu.my/7825/2/MOHAMED%20OSMAN%20MOHAMED%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7825/3/MOHAMED%20OSMAN%20MOHAMED%20WATERMARK.pdf
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spelling	my-uthm-ep.78252022-10-12T02:23:08Z Bandwidth enhancement of spiral antenna with defected ground structure 2018-01 Mohamed, Mohamed Osman TK Electrical engineering. Electronics Nuclear engineering TK7800-8360 Electronics In wireless communications systems, harmonics and unwanted frequency other than designed one becomes a dominant factor in limiting quality and capacity of transmitted or received signal. Rectangular spiral antenna (RSA) is designed in order to obtain the required parameter responses at 2.45 GHz for Wifi application. The proposed antenna is excited through the coaxial feed line which is connected from the ground of the antenna. RSA of length 16cm and width 20cm is designed on the substrate dielectric material FR-4 having dielectric constant er = 4.3 and thickness 1.6 mm. Conventional rectangular spiral antenna without DGS has very low bandwidth. This antenna has 64.8MHz which is very low and the fractional percentage is 2.63%. The defect ground structure (DGS) has gained much attention over the last few years for its ability to enhance the bandwidth and gain. After applied DGS the bandwidth enhanced to 245MHz which is very high compared to the conventional antenna. The antenna without DGS has multiple frequencies which are 1.3734, 2.0886 and 2.6538 other than the desired frequency.The DGS also effectively suppress harmonics frequencies of the spiral antenna, shows a better result compared to the conventional antenna. It effectively suppressing spurious frequency and reduces the amplitude of the unwanted multiple bands since the antenna radiates only one resonating frequency. 2018-01 Thesis http://eprints.uthm.edu.my/7825/ http://eprints.uthm.edu.my/7825/1/24p%20MOHAMED%20OSMAN%20MOHAMED.pdf text en public http://eprints.uthm.edu.my/7825/2/MOHAMED%20OSMAN%20MOHAMED%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/7825/3/MOHAMED%20OSMAN%20MOHAMED%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TK Electrical engineering Electronics Nuclear engineering TK7800-8360 Electronics
spellingShingle	TK Electrical engineering Electronics Nuclear engineering TK7800-8360 Electronics Mohamed, Mohamed Osman Bandwidth enhancement of spiral antenna with defected ground structure
description	In wireless communications systems, harmonics and unwanted frequency other than designed one becomes a dominant factor in limiting quality and capacity of transmitted or received signal. Rectangular spiral antenna (RSA) is designed in order to obtain the required parameter responses at 2.45 GHz for Wifi application. The proposed antenna is excited through the coaxial feed line which is connected from the ground of the antenna. RSA of length 16cm and width 20cm is designed on the substrate dielectric material FR-4 having dielectric constant er = 4.3 and thickness 1.6 mm. Conventional rectangular spiral antenna without DGS has very low bandwidth. This antenna has 64.8MHz which is very low and the fractional percentage is 2.63%. The defect ground structure (DGS) has gained much attention over the last few years for its ability to enhance the bandwidth and gain. After applied DGS the bandwidth enhanced to 245MHz which is very high compared to the conventional antenna. The antenna without DGS has multiple frequencies which are 1.3734, 2.0886 and 2.6538 other than the desired frequency.The DGS also effectively suppress harmonics frequencies of the spiral antenna, shows a better result compared to the conventional antenna. It effectively suppressing spurious frequency and reduces the amplitude of the unwanted multiple bands since the antenna radiates only one resonating frequency.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Mohamed, Mohamed Osman
author_facet	Mohamed, Mohamed Osman
author_sort	Mohamed, Mohamed Osman
title	Bandwidth enhancement of spiral antenna with defected ground structure
title_short	Bandwidth enhancement of spiral antenna with defected ground structure
title_full	Bandwidth enhancement of spiral antenna with defected ground structure
title_fullStr	Bandwidth enhancement of spiral antenna with defected ground structure
title_full_unstemmed	Bandwidth enhancement of spiral antenna with defected ground structure
title_sort	bandwidth enhancement of spiral antenna with defected ground structure
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
publishDate	2018
url	http://eprints.uthm.edu.my/7825/1/24p%20MOHAMED%20OSMAN%20MOHAMED.pdf http://eprints.uthm.edu.my/7825/2/MOHAMED%20OSMAN%20MOHAMED%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7825/3/MOHAMED%20OSMAN%20MOHAMED%20WATERMARK.pdf
_version_	1747831198087905280

Bandwidth enhancement of spiral antenna with defected ground structure

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