A tunable microstrip bandpass filter with two independently adjustable transmission zeros

Jiang Long, Changzhi Li, Wanzhao Cui, Jiangtao Huangfu, Lixin Ran

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

In this letter, a tunable microstrip bandpass filter (BPF) with two independently adjustable transmission zeros (TZs) is reported. By introducing two microwave varactors to tune the TZs, the center frequency and the bandwidth of the BPF can be separately adjusted within a broad tuning range by varying the dc bias voltages applied to the varactors. Theoretical analysis and design approach are described. The experimental result of a demonstrative BPF shows that a less than 4 dB insertion loss, a relative bandwidth of 9% and a center frequency tunable from 1.4 to 2 GHz are obtained. The measured performance of the fabricated filter shows good agreement with the proposed theory.

Original languageEnglish
Article number5711408
Pages (from-to)74-76
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume21
Issue number2
DOIs
StatePublished - Feb 2011

Keywords

  • Bandpass filter (BPF)
  • microstrip filter
  • transmission zero
  • tunable filter
  • varactor

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