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 contributionpeer-review

    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
    Country/TerritoryTaiwan
    CityKaohsiung
    Period4/12/127/12/12

    Keywords

    • Bandwidth enhancement
    • branch-line coupler
    • quadrature hybrid

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