Novel dual-band filter incorporating defected SIR and microstrip SIR

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)


This letter presents a novel approach to design dual-band bandpass filter by using defected stepped impedance resonator (DSIR) and microstrip stepped impedance resonator (MSIR). A pair of MSIRs on the upper plane forms a cross coupled filtering passage, and a pair of DSIRs at the lower plane constructs a linear phase filtering passage. Both of them are fed by a common T-shaped microstrip feed line with source-load coupling. Then they are directly combined to construct a compact dual-band filter with two passbands centering at 2.35 GHz and 3.15 GHz, respectively. The measurement results agree well with the full-wave electromagnetic designed responses.

Original languageEnglish
Article number4530749
Pages (from-to)392-394
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number6
Publication statusPublished - Jun 2008


  • Bandpass filter (BPF)
  • Defected stepped impedance resonator (DSIR)
  • Dual-band
  • Microstrip stepped impedance resonator (MSIR)


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