Miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique

Branch-line coupler is an important element in modern microwave circuit. A more compact and wideband prototype is preferred, since; it lowers the production cost and could operate well in wider bandwidth. However, most conventional branch line couplers consume bigger spacing and operate in narrow ba...

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Main Author:	Chong, Jaw Chung
Format:	Thesis
Language:	English
Published:	2016
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/60059/1/ChongJawChungMFKE2016.pdf
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spelling	my-utm-ep.600592020-11-15T10:02:59Z Miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique 2016-08 Chong, Jaw Chung TK Electrical engineering. Electronics Nuclear engineering Branch-line coupler is an important element in modern microwave circuit. A more compact and wideband prototype is preferred, since; it lowers the production cost and could operate well in wider bandwidth. However, most conventional branch line couplers consume bigger spacing and operate in narrow bandwidth. In this research, a wideband three-branch line coupler and four-branch line coupler, which are 20.6 % and 50.2 % respectively, compact than conventional couplers, had been miniaturized using Slow Wave Structure (SWS) and Meandering Line (ML) techniques. The cascade method is implemented on conventional coupler for increasing its bandwidth. The fabricated area of modified three-branch line and fourbranch line coupler is (1729.9 mm2) and (1927.8 mm2), respectively. Both prototypes were fabricated using etching technique. The performance results were obtained using Keysight E5071C VNA (Vector Network Analyzer). Calibration had been done to VNA for all types of measurement. Its important parameters such as return loss \|S11\|, through \|S21\|, coupling \|S31\| and isolation \|S41\| are studied for both conventional and modified designs, within the frequency range of 1.0 GHz to 5.0 GHz. The AWR Microwave Office Software is used for simulation, and designing the prototypes using 2.4 GHz as centre frequency, where the operating bandwidth remains at 1.5 GHz to 3.5 GHz. The performance of both prototypes were validated by comparing the simulation and measurement results, where, they show good agreement in S-parameters performance similar to the conventional ones, or even better. The modified three-branch line coupler experienced \|S11\| below -13 dB with operating frequency band of 1.5 GHz, which is 0.1 GHz wider than conventional design performance with 1.4 GHz frequency band, whereas, the modified fourbranch line coupler experienced \|S11\| below -13 dB with operating frequency band of 2.0 GHz, which is 0.6 GHz wider than conventional design performance with 1.4 GHz frequency band. In conclusion, the modified prototypes are more compact, making it make portable and operates well within wider operating bandwidth. 2016-08 Thesis http://eprints.utm.my/id/eprint/60059/ http://eprints.utm.my/id/eprint/60059/1/ChongJawChungMFKE2016.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:93784 masters 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 Chong, Jaw Chung Miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique
description	Branch-line coupler is an important element in modern microwave circuit. A more compact and wideband prototype is preferred, since; it lowers the production cost and could operate well in wider bandwidth. However, most conventional branch line couplers consume bigger spacing and operate in narrow bandwidth. In this research, a wideband three-branch line coupler and four-branch line coupler, which are 20.6 % and 50.2 % respectively, compact than conventional couplers, had been miniaturized using Slow Wave Structure (SWS) and Meandering Line (ML) techniques. The cascade method is implemented on conventional coupler for increasing its bandwidth. The fabricated area of modified three-branch line and fourbranch line coupler is (1729.9 mm2) and (1927.8 mm2), respectively. Both prototypes were fabricated using etching technique. The performance results were obtained using Keysight E5071C VNA (Vector Network Analyzer). Calibration had been done to VNA for all types of measurement. Its important parameters such as return loss \|S11\|, through \|S21\|, coupling \|S31\| and isolation \|S41\| are studied for both conventional and modified designs, within the frequency range of 1.0 GHz to 5.0 GHz. The AWR Microwave Office Software is used for simulation, and designing the prototypes using 2.4 GHz as centre frequency, where the operating bandwidth remains at 1.5 GHz to 3.5 GHz. The performance of both prototypes were validated by comparing the simulation and measurement results, where, they show good agreement in S-parameters performance similar to the conventional ones, or even better. The modified three-branch line coupler experienced \|S11\| below -13 dB with operating frequency band of 1.5 GHz, which is 0.1 GHz wider than conventional design performance with 1.4 GHz frequency band, whereas, the modified fourbranch line coupler experienced \|S11\| below -13 dB with operating frequency band of 2.0 GHz, which is 0.6 GHz wider than conventional design performance with 1.4 GHz frequency band. In conclusion, the modified prototypes are more compact, making it make portable and operates well within wider operating bandwidth.
format	Thesis
qualification_level	Master's degree
author	Chong, Jaw Chung
author_facet	Chong, Jaw Chung
author_sort	Chong, Jaw Chung
title	Miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique
title_short	Miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique
title_full	Miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique
title_fullStr	Miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique
title_full_unstemmed	Miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique
title_sort	miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2016
url	http://eprints.utm.my/id/eprint/60059/1/ChongJawChungMFKE2016.pdf
_version_	1747817753302007808

Miniaturized wideband hybrid directional coupler using slow wave structure meandering lines technique

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