Design of a novel quad-band microstrip BPF using quarter-wavelength stepped-impedance resonators

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

Research output: Contribution to specialist publicationArticle

21 Citations (Scopus)


In this article, a new quad-band microstrip bandpass filter (BPF) is proposed. The BPF is composed of resonators whose first four resonant frequencies can be tuned to the desired passbands. Each resonator is formed by combining two unequal-size stepped-impedance resonators (SIR) with part of their structures shared. The designed quad-band BPF is implemented on an RT/Duroid 6010 substrate. The measured fractional bandwidths (minimum insertion losses) for the 1.57 GHz (GPS), 2.45 GHz (ISM), 3.55 GHz (WiMAX) and 5.25 GHz (WLAN) bands are 6.4 percent (1.85 dB), 8.2 percent (1.4 dB), 8.7 percent (2 dB) and 12.2 percent (1.06 dB), respectively, which agree well with the simulated results. For miniaturization purposes, the resonators are meandered to give an overall circuit size of only 12.3×9.1 mm.

Original languageEnglish
Number of pages11
Specialist publicationMicrowave Journal
Publication statusPublished - 2007 Feb 1


All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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