A synthesis method for dual-passband microwave filters

Juseop Lee, Kamal Sarabandi

Research output: Contribution to journalArticlepeer-review

137 Citations (Scopus)


This paper describes a synthesis method for symmetric dual-passband microwave filters. The proposed method employs frequency transformation techniques for finding the locations of poles and zeros of a desired filter. This method can be used to design dual-passband filters with prescribed passbands and attenuation at stopbands directly without the need for any optimization processes. To validate the procedure a dual-pass-band stripline filter is designed and fabricated. The stripline dual-passband filter is designed with passbands at 3.90-3.95 and 4.05-4.10 GHz, and 30-dB attenuation at the stopband. This measured results show a good agreement with the theoretical ones. The frequency transformation for symmetric dual-passband filters is also extended to include asymmetric dual-passband responses. This flexible frequency transformation preserves the attenuation characteristics of the low-pass filter prototype. Examples are shown to discuss the flexibility of this transformation.

Original languageEnglish
Pages (from-to)1163-1170
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number6
Publication statusPublished - 2007 Jun
Externally publishedYes


  • Circuit synthesis
  • Dual-passband filters
  • Microwave filters

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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