Varactor-tuned dual-mode bandpass filters

Wenxing Tang, Jia Sheng Hong

Research output: Contribution to journalArticlepeer-review

115 Citations (Scopus)


This paper presents a new type of varactor-tuned dual-mode bandpass filter. Since the two operating modes (i.e., the odd and even modes) in a dual-mode microstrip open-loop resonator do not couple to each other, the tuning of the passband frequency becomes simple with a single dc-bias circuit while keeping nearly constant absolute bandwidth. Design equations and procedures are derived, and two two-pole tunable bandpass filters of this type are demonstrated experimentally. © 2010 IEEE.

Original languageEnglish
Article number5508429
Pages (from-to)2213-2219
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number8
Publication statusPublished - Aug 2010


  • Dual-mode resonator filter
  • microstrip filters
  • tunable filter


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