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

Seunggoo Nam, Boyoung Lee, Ju Seop Lee

Research output: Contribution to journalArticle

5 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 1

Keywords

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

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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