Simple method to design a tri-band bandpass filter using asymmetric SIRs for GSM, WIMAX, and WLAN applications

Wei Yu Chen, Yi Hsin Su, Hon Kuan, Shoou Jinn Chang

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

This paper presents a simple method to design a tri-band bandpass filter (BPF) using asymmetric stepped-impedance resonators (SIRs) with one-step discontinuity.Only two SIRs are needed in the filter structure. The tri-band passband responses can be achieved by properly selecting the length ratio (u) and the impedance ratio (R) of the asymmetric SIRs. The performances can be further well tuned by the lengths of two enhanced coupling structure and gap of two asymmetric SIRs. A filter example for the applications of GSM at 1.8 GHz, WiMAX at 3.5 GHz and WLAN at 5.2 GHz was designed and fabricated. The measured results are in good agreement with the full-wave simulation results.

Original languageEnglish
Pages (from-to)1573-1576
Number of pages4
JournalMicrowave and Optical Technology Letters
Volume53
Issue number7
DOIs
Publication statusPublished - 2011 Jul

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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