Filtenna design with selectivity enhancement for modern communication system

This thesis presents filtenna design with selectivity enhancement for modern communication systems. Filtennas are designed to simplify the radio frequency (RF) front-end, reduce cost and eliminate signal losses. Two filters, (Filter A and Filter B) and two filtennas, (Filtenna A and Filtenna B) have...

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Main Author:	Obadiah, Ali Nyangwarimam
Format:	Thesis
Language:	English
Published:	2018
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/79474/1/AliNyangwarimamObadiahPFKE2018.pdf
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spelling	my-utm-ep.794742018-10-31T12:41:33Z Filtenna design with selectivity enhancement for modern communication system 2018 Obadiah, Ali Nyangwarimam TK Electrical engineering. Electronics Nuclear engineering This thesis presents filtenna design with selectivity enhancement for modern communication systems. Filtennas are designed to simplify the radio frequency (RF) front-end, reduce cost and eliminate signal losses. Two filters, (Filter A and Filter B) and two filtennas, (Filtenna A and Filtenna B) have been designed to overcome a few drawback such as decrease in the peak gain, poor selectivity, increase in feeding area and structure complexity of the existing filtennas. Filtenna A and Filtenna B are designed based on Filter A and Filter B, respectively, by using filter synthesis technique. All designed structures were simulated using Computer Simulation Technology (CST) Microwave Studio and validated through fabrication and measurement of the prototypes. Firstly, an improved technique for creating sharp selectivity of a T-shaped stub bandpass filter (Filter A) is designed. The T-shaped stub is loaded with vertical resonators to produce good selectivity at both edges of the passband at 3.6 GHz. The advantage of this filter is the potential ability to adjust the center frequency and the bandwidth to suit the system demands. Secondly, a novel and compact second order Chebyshev bandpass filter (Filter B) with sharp selectivity is designed to operate at 5.8 GHz. The sharp selectivity is obtained by using U-shaped resonators and Defected Ground Structure which are responsible for the rejection at the higher and lower band edge, respectively. The advantage of this design is size compactness. About 56% area reduction is achieved over the second order Hairpin bandpass filter. Thirdly, the T-shaped stub bandpass filter is synthesized with a microstrip patch antenna to form a T-shaped stub fed filtenna (Filtenna A) with enhanced selectivity. The advantage of this design is that it maintains the same bandwidth as the conventional patch antenna with enhanced gain and good out-of-band suppression. The fourth design involves the synthesis of the second order Chebyshev designed filter with a U-shaped patch (Filtenna B). The designed filtenna operates at 5.8 GHz and has sharp selectivity as no degradation of the peak gain. The superiority of the proposed design over the conventional patch antenna is verified by a 99 % decrease in the out-of-band suppression and a 11.86 % increase in the gain performance. The designed filtennas address the limitations faced by existing filtennas and can be used in Wireless Local Area Network (WLAN) application. 2018 Thesis http://eprints.utm.my/id/eprint/79474/ http://eprints.utm.my/id/eprint/79474/1/AliNyangwarimamObadiahPFKE2018.pdf application/pdf en public 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 Obadiah, Ali Nyangwarimam Filtenna design with selectivity enhancement for modern communication system
description	This thesis presents filtenna design with selectivity enhancement for modern communication systems. Filtennas are designed to simplify the radio frequency (RF) front-end, reduce cost and eliminate signal losses. Two filters, (Filter A and Filter B) and two filtennas, (Filtenna A and Filtenna B) have been designed to overcome a few drawback such as decrease in the peak gain, poor selectivity, increase in feeding area and structure complexity of the existing filtennas. Filtenna A and Filtenna B are designed based on Filter A and Filter B, respectively, by using filter synthesis technique. All designed structures were simulated using Computer Simulation Technology (CST) Microwave Studio and validated through fabrication and measurement of the prototypes. Firstly, an improved technique for creating sharp selectivity of a T-shaped stub bandpass filter (Filter A) is designed. The T-shaped stub is loaded with vertical resonators to produce good selectivity at both edges of the passband at 3.6 GHz. The advantage of this filter is the potential ability to adjust the center frequency and the bandwidth to suit the system demands. Secondly, a novel and compact second order Chebyshev bandpass filter (Filter B) with sharp selectivity is designed to operate at 5.8 GHz. The sharp selectivity is obtained by using U-shaped resonators and Defected Ground Structure which are responsible for the rejection at the higher and lower band edge, respectively. The advantage of this design is size compactness. About 56% area reduction is achieved over the second order Hairpin bandpass filter. Thirdly, the T-shaped stub bandpass filter is synthesized with a microstrip patch antenna to form a T-shaped stub fed filtenna (Filtenna A) with enhanced selectivity. The advantage of this design is that it maintains the same bandwidth as the conventional patch antenna with enhanced gain and good out-of-band suppression. The fourth design involves the synthesis of the second order Chebyshev designed filter with a U-shaped patch (Filtenna B). The designed filtenna operates at 5.8 GHz and has sharp selectivity as no degradation of the peak gain. The superiority of the proposed design over the conventional patch antenna is verified by a 99 % decrease in the out-of-band suppression and a 11.86 % increase in the gain performance. The designed filtennas address the limitations faced by existing filtennas and can be used in Wireless Local Area Network (WLAN) application.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Obadiah, Ali Nyangwarimam
author_facet	Obadiah, Ali Nyangwarimam
author_sort	Obadiah, Ali Nyangwarimam
title	Filtenna design with selectivity enhancement for modern communication system
title_short	Filtenna design with selectivity enhancement for modern communication system
title_full	Filtenna design with selectivity enhancement for modern communication system
title_fullStr	Filtenna design with selectivity enhancement for modern communication system
title_full_unstemmed	Filtenna design with selectivity enhancement for modern communication system
title_sort	filtenna design with selectivity enhancement for modern communication system
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2018
url	http://eprints.utm.my/id/eprint/79474/1/AliNyangwarimamObadiahPFKE2018.pdf
_version_	1747818235071299584

Filtenna design with selectivity enhancement for modern communication system

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