Tunable, High-Q, Substrate-Integrated, Evanescent-Mode Cavity Bandpass-Bandstop Filter Cascade

Shahrokh Saeedi, Juseop Lee, Hjalti H. Sigmarsson

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


A new single substrate-integrated bandpass-bandstop (BP-BS) filter cascade, implemented using high-Q, heavily-loaded, evanescent-mode cavity filters, is presented. The cascade has the capability of dynamically tuning its passband and stopband at any two independent frequencies within a frequency range. A modular design approach is used to design the cascade by directly cascading synthesized coupling matrices of bandpass and bandstop filters. To demonstrate the concept, a 4% second-order Butterworth bandpass filter is integrated with a second-order Butterworth bandstop filter, with 2% fractional bandwidth at 10-dB rejection, to form a cascade that can be tuned continuously from 3000 to 3600 MHz. Measurement shows that a filter cascade with insertion loss as low as 0.9 dB and isolation as high as 100 dB is feasible.

Original languageEnglish
Article number7440812
Pages (from-to)240-242
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number4
Publication statusPublished - 2016 Apr

Bibliographical note

Publisher Copyright:
© 2015 IEEE.


  • Bandpass
  • bandstop
  • coupling matrix
  • filter cascade
  • microwave filter
  • substrate-integrated
  • synthesis
  • tunable

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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