Computer-aided design of microstrip extracted-pole lossy filter

Zhou Zhou, Jia-Sheng Hong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In this article, computer-aided design of a new type of microstrip lossy filter is described. The new type of lossy filter is realized by introducing resistive cross couplings into a microstrip extracted-pole filter to achieve a flat passband. The high selectivity is achieved by introducing 2 transmission zeros using 2 extracted poles, which can be adjusted. An equivalent circuit model is established and its circuit parameters, which are useful for physical implementation of the filter, are determined in light of computer modeling. For demonstration, two 6-pole filters centered at 2 GHz with fractional bandwidth (FBW) 6% and 20% are implemented. Experimental results, together with a theoretical comparison between different FBWs, and full-wave electromagnetic simulation results are also presented.

Original languageEnglish
Article numbere21241
JournalInternational Journal of RF and Microwave Computer-Aided Engineering
Issue number5
Early online date13 Jan 2018
Publication statusPublished - Jun 2018


  • extracted-pole technique
  • microstrip lossy filter
  • resistive cross coupling
  • step-impedance resonator

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design
  • Electrical and Electronic Engineering


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