Compact dual-band filter using defected stepped impedance resonator

Bian Wu*, Chang Hong Liang, Pei Yuan Qin, Qi Li

*Corresponding author for this work

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

This letter presents a novel approach for designing a dual-band bandpass filter by using defected stepped impedance resonator (DSIR). The resonant frequency of the DSIR is found to be much lower than that of the conventional microstrip stepped impedance resonator (SIR), which reduces the circuit size effectively. Two types of second-order DSIR microstrip bandpass filter operating at 1.85 and 2.35 GHz, respectively, are well designed according to the classical theory of coupled resonator filter. Then they are combined to construct a compact dual-band filter with a common parallel microstrip feed line, the measurement results of the fabricated filter have a good agreement with the simulation.

Original languageEnglish
Article number4639544
Pages (from-to)674-676
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume18
Issue number10
DOIs
Publication statusPublished - Oct 2008

Keywords

  • Bandpass filter
  • Compact size
  • Defected stepped impedance resonator (DSIR)
  • Dual-band

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