Novel compact parallel-coupled microstrip bandpass filters with lumped-element K-inverters

Yo Shen Lin, Chi Hsueh Wang, Chao Huang Wu, Chun Hsiung Chen

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Novel compact parallel-coupled microstrip bandpass filters are proposed by using additional lumped inductors to realize K-inverters between coupled-line sections to achieve an equivalent to the quarter-wavelength (λ/4) resonator filters. As a result, the filter order can be doubled without increasing the circuit area, and no repeated passband is observed at twice the center frequency. In addition, by introducing the cross-coupling effect, two transmission zeros at upper and lower stopbands may be created. Simple equivalent-circuit models are also established as effective design tools. Specifically, several compact fourth-order microstrip bandpass filters with good stopband rejection are implemented and carefully examined.

Original languageEnglish
Pages (from-to)2324-2327
Number of pages4
JournalIEEE Transactions on Microwave Theory and Techniques
Volume53
Issue number7
DOIs
StatePublished - Jul 2005

Keywords

  • Bandpass filter
  • Coupled line
  • Lumped element
  • Microstrip

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