An investigation of performance enhancement for tunable microstrip filter

Jia Ni*, Wenxing Tang, Zhang-Cheng Hao, Jiasheng Hong

*Corresponding author for this work

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

5 Citations (Scopus)


This paper reports an investigation of performance enhancement for electronically tunable microstrip filter. Based on the effects of lossy components on passband response of a bandpass filter, a new concept to improve the performance (passband flatness and selectivity) is proposed. Unlike other techniques published, this new concept results in nonuniform Q distribution by loading lumped elements to reduce the unloaded Q of the resonator. As examples, fixed and tunable microstrip combline filters with narrow band are simulated and fabricated to validate the proposed concept.

Original languageEnglish
Title of host publication41st European Microwave Week 2011
Number of pages4
ISBN (Electronic)9782874870224
ISBN (Print)9781612842356
Publication statusPublished - 15 Dec 2011
Event41st European Microwave Conference 2011 - Manchester, United Kingdom
Duration: 10 Oct 201113 Oct 2011


Conference41st European Microwave Conference 2011
Country/TerritoryUnited Kingdom


  • Filter predistortion
  • lossy circuit
  • nonuniform Q distribution
  • tunable microstrip filter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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