Miniature CPW parallel-coupled bandpass filter based on inductive loaded coupled-lines and lumped-element J-inverters

Yo Shen Lin, Chien Chun Cheng

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

This study presents a compact coplanar-waveguide (CPW) parallel-coupled bandpass filter (BPF) with good selectivity and stopband rejection. The inductive terminations are introduced to the conventional anti-parallel coupled-lines, and lumped-element J-inverters are employed, to achieve both size reduction and spurious suppression. Additionally, the inductive cross-coupling effect is introduced to obtain two transmission zeros to enhance the selectivity. Suitable equivalent-circuit model is also established as effective design tool. Specifically, this work demonstrates a compact cross-coupled fourth-order BPF in grounded-CPW configuration. Compared to the conventional filters, the proposed filters exhibit over 65% size reduction, improved selectivity, and wider stopbands up to four times the center frequency.

Original languageEnglish
Pages (from-to)343-345
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume17
Issue number5
DOIs
StatePublished - May 2007

Keywords

  • Bandpass filter (BPF)
  • Coupled-line
  • Cross-coupled
  • Inductive loaded
  • J-inverter
  • Lumped-element
  • Parallel-coupled

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