Dual-band balanced bpf using λ/4 steppedimpedance resonators and folded feed lines

C. H. Lee, I. C. Wang, C. I.G. Hsu

Research output: Contribution to journalArticle

41 Citations (Scopus)


This paper presents a second-order dual-band balanced bandpass filter (BPF) designed using bi-section quarter-wavelength (λ/4) stepped-impedance resonators (SIRs) and folded feed lines. The first two modes of the λ/4 SIRs are designed to resonate in the designated 2.4- and 5.2-GHz WLAN bands. High-impedance folded transmission-line sections are inserted in series with the feed lines to improve the overall impedance matching at the input/output ports, so that the signal transmission can be enhanced. In addition, the feed lines and λ/4 SIRs are properly arranged to form an all-stoplike coupling configuration for common-mode operation. For the first (second) operating band of interest, the fabricated balanced BPF printed on an FR4 substrate was measured to have a minimum differential-mode insertion loss of 3.03 dB (4.3 dB) and a minimum common-mode rejection level of as high as 15.7 dB (22.3 dB).

Original languageEnglish
Pages (from-to)2441-2449
Number of pages9
JournalJournal of Electromagnetic Waves and Applications
Issue number17-18
Publication statusPublished - 2009 Jan 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Dual-band balanced bpf using λ/4 steppedimpedance resonators and folded feed lines'. Together they form a unique fingerprint.

  • Cite this