Parallel-coupled coplanar-waveguide bandpass filter with multiple transmission zeros

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

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A compact parallel-coupled coplanar-waveguide bandpass filter with good selectivity and stopband response is proposed. By using the quarter-wavelength resonators in implementation, the filter size can be reduced and no spurious passband is observed at twice the center frequency (2f0). In addition, by suitably introducing the capacitive and inductive cross-coupling effects, four transmission zeros around the passband edges may be created for improving the filter selectivity. For design purpose, the equivalent-circuit models are also established. In this study, the compact fourth-order filter with multiple transmission zeros for improving the selectivity is implemented, and its stopband is extended up to 3.43 f0 with a rejection better than -30 dB.

Original languageEnglish
Pages (from-to)118-120
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number2
StatePublished - Feb 2007


  • Bandpass filter (BPF)
  • Coplanar waveguide (CPW)
  • Coupled lines


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