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

Research output: Chapter in Book/Report/Conference proceedingConference 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 languageEnglish
Title of host publication2012 Asia-Pacific Microwave Conference, APMC 2012 - Proceedings
Pages989-991
Number of pages3
DOIs
StatePublished - 1 Dec 2012
Event2012 Asia-Pacific Microwave Conference, APMC 2012 - Kaohsiung, Taiwan
Duration: 4 Dec 20127 Dec 2012

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC

Conference

Conference2012 Asia-Pacific Microwave Conference, APMC 2012
CountryTaiwan
CityKaohsiung
Period4/12/127/12/12

Keywords

  • Bandwidth enhancement
  • branch-line coupler
  • quadrature hybrid

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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