Extended-stopband bandpass filter using both half- and quarter-wavelength resonators

Shih Cheng Lin, Yo Shen Lin, Chun Hsiung Chen

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

A novel quasielliptic microstrip bandpass filter (BPF) using both half- and quarter-wavelength resonators is proposed. With the quarter-wavelength (λ/4) resonators placed in the interstage, the filter spurious passband can be pushed up to 3 f 0 where f 0 stands for the passband center frequency. To improve the stopband characteristics, a modified stopband-extended filter is implemented, utilizing the multiple transmission zeros placed at specified frequencies to achieve good frequency selectivity and out-of-band rejection. The modified filter provides a 22.5-dB rejection level from 1.14 f 0 to 5.2 f 0.

Original languageEnglish
Pages (from-to)43-45
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume16
Issue number1
DOIs
StatePublished - Jan 2006

Keywords

  • Cross-coupled bandpass filter (BPF)
  • Extended stopband
  • Half-wavelength resonator
  • Microstrip
  • Quarter-wave-length resonator

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