Double conversion method for synthesis of inverse filters

Shahrokh Saeedi, Ju Seop Lee, Hjalti H. Sigmarsson

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A novel method for the inverse filter synthesis of the same type from an original filter is presented. The proposed procedure utilizes a double conversion, frequency inversion and swapping the transfer and reflection functions, which are commonly used for lowpass to highpass filter transformation. Due to the use of double conversions, the resulting filter always has the same type as the original filter. Using this procedure, the available general Chebyshev synthesis method can be used to synthesize inverse Chebyshev and elliptic filters. As an illustration, the coupling matrix of a third-order inverse Chebyshev bandpass filter is synthesized using the presented method. Then the original filter and its inverse filter are fabricated using microstrip technology. The measured and simulated filter results are shown to be in good agreement.

Original languageEnglish
Title of host publication2015 IEEE MTT-S International Microwave Symposium, IMS 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781479982752
Publication statusPublished - 2015 Jul 24
EventIEEE MTT-S International Microwave Symposium, IMS 2015 - Phoenix, United States
Duration: 2015 May 172015 May 22


OtherIEEE MTT-S International Microwave Symposium, IMS 2015
Country/TerritoryUnited States


  • Elliptic
  • filter synthesis
  • filter transformation
  • generalized Chebyshev
  • inverse Chebyshev

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing
  • Electrical and Electronic Engineering


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