Design of a new tri-band microstrip BPF using combined quarter-wavelength SIRs

Ching Her Lee, Chung I.G. Hsu, He Kai Jhuang

Research output: Contribution to journalArticlepeer-review

141 Citations (Scopus)


A new tri-band microstrip bandpass filter (BPF) is designed to produce three passbands at the commercially practical frequencies through a single piece of filter circuitry. The basic component used to build the proposed filter consists of two quarter-wavelength (λ/4) stepped-impedance resonators (SIRs). One of the λ/4 SIRs is designed to operate at 1.57 GHz and 5.25 GHz, and the other at 2.45 GHz. The feed positions for the two λ/4 SIRs are carefully located to have the same distance from the via-hole ground and meanwhile to give the required external quality factors (Qe's). In such a way, the microstripline sections between the via-hole and each of the feed positions can be combined into one to simplify the filter structure, and to reduce the BPF circuit size. Performance of the newly designed tri-band BPF is verified by measured results.

Original languageEnglish
Article number1717514
Pages (from-to)594-596
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number11
Publication statusPublished - 2006 Nov 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Design of a new tri-band microstrip BPF using combined quarter-wavelength SIRs'. Together they form a unique fingerprint.

Cite this