Design of miniature wideband interdigital filters

Neil Thomson, Jia Sheng Hong, Robert Greed, Daniel Voyce

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this paper a practical design procedure is suggested for designing wide-band miniature interdigital filters. The proposed design approach is based on a concept of parameter mapping between two wideband filters, i.e. a conventional interdigital filter with uniform impedance resonators (UIR) and a desired miniature interdigital filter using stepped impedance resonators (SIR), allowing filter designers to deploy traditional designs with powerful electromagnetic (EM) simulators. For demonstration, a five-pole SIR interdigital filter with a fractional bandwidth (FBW) of 25% has been designed, fabricated, and tested. The demonstrator shows an excellent performance, which matches well to that of its conventional counterpart so as to validate the proposed design procedure. © 2006 Wiley Periodicals, Inc.

Original languageEnglish
Pages (from-to)90-95
Number of pages6
JournalInternational Journal of RF and Microwave Computer-Aided Engineering
Issue number1
Publication statusPublished - Jan 2007


  • Interdigital
  • Stepped impedance resonators
  • Symmetrical interdigital
  • Uniform impedance resonators
  • Wideband bandpass filters


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