Design of triple-passband microwave filters using frequency Transformations

Juseop Lee, Kamal Sarabandi

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)


This paper introduces a synthesis method for triplepassband microwave filters. A frequency transformation is developed for finding the locations of poles and zeros of the triple-passband filter. The poles and zeros obtained as such are optimized to achieve a transfer function with a reduced number of transmission zeros in order to reduce the number of cross-couplings. Sixand 12-pole triple-passband filters are synthesized for validation of this proposed method. A 12-pole triple-passband filter is fabricated with a microstripline structure and shown to provide good agreement between synthesis and measurement results. Finally, the frequency transformation for asymmetric triple-passband filters is briefly discussed.

Original languageEnglish
Pages (from-to)187-193
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number1
Publication statusPublished - 2008 Jan
Externally publishedYes


  • Circuit synthesis
  • Microwave filters
  • Triple-passband filters

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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