Bandwidth-enhanced branch-line coupler using the center-loaded vertical line and distributed capacitors

Tse Yu Chen; Pei-Ling Chi

doi:10.1109/APMC.2012.6421801

Bandwidth-enhanced branch-line coupler using the center-loaded vertical line and distributed capacitors

Tse Yu Chen^*, Pei-Ling Chi

^*Corresponding author for this work

Department of Electrical and Computer Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

In this paper, the technique that loads the center of the horizontal transmission lines in a conventional branch-line coupler by a vertical line section as well as the distributed capacitors is presented to enhance the coupler bandwidths. Based on the proposed structure, the numerical solution derived from the even/odd-mode decomposition analysis for optimized bandwidth enhancement is applied for structural parameters. Experimental results show that the developed 90° coupler demonstrates more than 11% return-loss/isolation bandwidth increase as compared to the conventional quadrature hybrid. Furthermore, the 3dB±1dB magnitude-and 90°±5o phase-difference bandwidths are 3% and 14% increased, respectively.

Original language	English
Title of host publication	2012 Asia-Pacific Microwave Conference, APMC 2012 - Proceedings
Pages	989-991
Number of pages	3
DOIs	https://doi.org/10.1109/APMC.2012.6421801
State	Published - 1 Dec 2012
Event	2012 Asia-Pacific Microwave Conference, APMC 2012 - Kaohsiung, Taiwan Duration: 4 Dec 2012 → 7 Dec 2012

Publication series

Name	Asia-Pacific Microwave Conference Proceedings, APMC

Conference

Conference	2012 Asia-Pacific Microwave Conference, APMC 2012
Country	Taiwan
City	Kaohsiung
Period	4/12/12 → 7/12/12

Keywords

Bandwidth enhancement
branch-line coupler
quadrature hybrid

Access to Document

10.1109/APMC.2012.6421801

Link to publication in Scopus

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Chen, T. Y., & Chi, P-L. (2012). Bandwidth-enhanced branch-line coupler using the center-loaded vertical line and distributed capacitors. In 2012 Asia-Pacific Microwave Conference, APMC 2012 - Proceedings (pp. 989-991). [6421801] (Asia-Pacific Microwave Conference Proceedings, APMC). https://doi.org/10.1109/APMC.2012.6421801

@inproceedings{38ae62d4e80943f59b11519c9aea7054,

title = "Bandwidth-enhanced branch-line coupler using the center-loaded vertical line and distributed capacitors",

abstract = "In this paper, the technique that loads the center of the horizontal transmission lines in a conventional branch-line coupler by a vertical line section as well as the distributed capacitors is presented to enhance the coupler bandwidths. Based on the proposed structure, the numerical solution derived from the even/odd-mode decomposition analysis for optimized bandwidth enhancement is applied for structural parameters. Experimental results show that the developed 90° coupler demonstrates more than 11% return-loss/isolation bandwidth increase as compared to the conventional quadrature hybrid. Furthermore, the 3dB±1dB magnitude-and 90°±5o phase-difference bandwidths are 3% and 14% increased, respectively.",

keywords = "Bandwidth enhancement, branch-line coupler, quadrature hybrid",

author = "Chen, {Tse Yu} and Pei-Ling Chi",

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doi = "10.1109/APMC.2012.6421801",

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note = "null ; Conference date: 04-12-2012 Through 07-12-2012",

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Chen, TY & Chi, P-L 2012, Bandwidth-enhanced branch-line coupler using the center-loaded vertical line and distributed capacitors. in 2012 Asia-Pacific Microwave Conference, APMC 2012 - Proceedings., 6421801, Asia-Pacific Microwave Conference Proceedings, APMC, pp. 989-991, 2012 Asia-Pacific Microwave Conference, APMC 2012, Kaohsiung, Taiwan, 4/12/12. https://doi.org/10.1109/APMC.2012.6421801

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N2 - In this paper, the technique that loads the center of the horizontal transmission lines in a conventional branch-line coupler by a vertical line section as well as the distributed capacitors is presented to enhance the coupler bandwidths. Based on the proposed structure, the numerical solution derived from the even/odd-mode decomposition analysis for optimized bandwidth enhancement is applied for structural parameters. Experimental results show that the developed 90° coupler demonstrates more than 11% return-loss/isolation bandwidth increase as compared to the conventional quadrature hybrid. Furthermore, the 3dB±1dB magnitude-and 90°±5o phase-difference bandwidths are 3% and 14% increased, respectively.

AB - In this paper, the technique that loads the center of the horizontal transmission lines in a conventional branch-line coupler by a vertical line section as well as the distributed capacitors is presented to enhance the coupler bandwidths. Based on the proposed structure, the numerical solution derived from the even/odd-mode decomposition analysis for optimized bandwidth enhancement is applied for structural parameters. Experimental results show that the developed 90° coupler demonstrates more than 11% return-loss/isolation bandwidth increase as compared to the conventional quadrature hybrid. Furthermore, the 3dB±1dB magnitude-and 90°±5o phase-difference bandwidths are 3% and 14% increased, respectively.

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