Design of compact microstrip dual-band bandpass filters with λ/4 stepped-impedance resonators

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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


This article presents a compact microstrip bandpass filter (BPF) design for the 2.45 and 5.25 GHz wireless local-area network (WLAN) applications. U-shaped quarter-wavelength stepped-impedance resonators (λ/4 SIRs), for which the circuit size is small and the second resonant frequency can he tuned over a wide range, are adopted in the BPF design. It is shown that the first spurious passbands of the resultant filters are farther away from their second passbands than are those of the corresponding filters using half-wavelength SIRs. Experiments on a second-order and a fourth-order BPF are conducted for validating the filter performance. Good agreement between the measured and the simulated results are observed.

Original languageEnglish
Pages (from-to)164-168
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number1
Publication statusPublished - 2007 Jan 1

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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