Positive-to-zero continuously tunable inter-resonator coupling structure for applications in filter array systems

Beyoungyoun Koh, Boyoung Lee, Seunggoo Nam, Ju Seop Lee

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    4 Citations (Scopus)

    Abstract

    This paper presents a novel positive-to-zero continuously tunable inter-resonator coupling structure for high Q substrate-integrated waveguide resonators. Two nearly nonmutually coupled distinct inter-resonator structures were integrated. One structure provides positive static inter-resonator coupling while the other composes a continuously tunable negative coupling. The negative coupling can be tuned to be large enough to cancel out the static positive coupling and create a near-zero inter-resonator coupling state. Using the proposed tunable structure, a second-order continuously tunable Butterworth filter has been designed and fabricated. The bandwidth of the fabricated filter can be tuned from 3% to 0% at 1.3 GHz. Similar tuning is possible for all frequencies within the frequency range 0.95 GHz ∼ 1.6 GHz. The fabricated filter has been measured to have frequency tuning ratio of 1.7:1.

    Original languageEnglish
    Title of host publication2015 IEEE MTT-S International Microwave Symposium, IMS 2015
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    ISBN (Print)9781479982752
    DOIs
    Publication statusPublished - 2015 Jul 24
    EventIEEE MTT-S International Microwave Symposium, IMS 2015 - Phoenix, United States
    Duration: 2015 May 172015 May 22

    Other

    OtherIEEE MTT-S International Microwave Symposium, IMS 2015
    Country/TerritoryUnited States
    CityPhoenix
    Period15/5/1715/5/22

    Keywords

    • Band-pass filters
    • Microwave circuits
    • Resonator filters

    ASJC Scopus subject areas

    • Computer Networks and Communications
    • Signal Processing
    • Electrical and Electronic Engineering

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