Theory for pseudo-butterworth filter response and its application to bandwidth tuning

Seunggoo Nam, Boyoung Lee, Juseop Lee

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    This paper presents a new class of filter responses called pseudo-Butterworth filter response. A detailed mathematical analysis on the pseudo-Butterworth response has been carried out. In addition, the comparison between the typical complete Butterworth response and the new pseudo-Butterworth response is provided. The theory for the pseudo-Butterworth filter response indicates that bandwidth tuning maintaining excellent return loss performance can be executed adjusting not all coupling structures of a filter. As an example, a bandwidth tuning method for a second-order filter is presented. For verifying the presented bandwidth tuning theory, a second-order substrate-integrated waveguide (SIW) resonator filter has been designed, fabricated, and measured. As an example of applications to higher order filters, a theory for the fourth-order pseudo-Butterworth responses and a bandwidth tuning method for the fourth-order filters have been developed. A fourth-order filter has also been fabricated and measured for verifying the presented bandwidth tuning technique.

    Original languageEnglish
    Article number7889058
    Pages (from-to)2847-2856
    Number of pages10
    JournalIEEE Transactions on Microwave Theory and Techniques
    Volume65
    Issue number8
    DOIs
    Publication statusPublished - 2017 Aug

    Bibliographical note

    Publisher Copyright:
    © 1963-2012 IEEE.

    Keywords

    • Bandpass filter
    • Butterworth
    • substrate-integrated waveguide (SIW)

    ASJC Scopus subject areas

    • Radiation
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

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