Novel Coupling Matrix Synthesis for Single-Layer Substrate-Integrated Evanescent-Mode Cavity Tunable Bandstop Filter Design

Shahrokh Saeedi, Ju Seop Lee, Hjalti H. Sigmarsson

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A new technique for designing tunable bandstop filters is presented. A novel coupling matrix synthesis method for this type of bandstop filter is shown. Phase cancellation, through combining two bandpass filters, is used to derive the coupling matrix. Therefore, classical coupling mechanisms utilized to implement bandpass filters can be used to design and realize bandstop filters. Using this method, bandstop filters can be designed without source-to-load coupling. This eliminates the need for a second substrate when compared to previously reported bandstop filters implemented using substrate-integrated evanescent-mode cavity technology, though the method itself is quite general. Finally, examples of tunable bandstop filters in the range from 3.0 to 3.6 GHz are demonstrated to verify the proposed method.

Original languageEnglish
Article number7305844
Pages (from-to)3929-3938
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Volume63
Issue number12
DOIs
Publication statusPublished - 2015 Dec 1

Keywords

  • Bandstop filter
  • coupling matrix synthesis
  • phase cancellation
  • source-to-load coupling
  • tunable

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

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