Balanced dual-band BPF with stub-loaded SIRs for common-mode suppression

Ching Her Lee, Chung I.G. Hsu, Chih Chan Hsu

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

A new fourth-order balanced dual-band band-pass filter (BPF) designed using four coupled bi-section half-wavelength (λ/2) stepped-impedance resonators (SIRs) is presented. To obtain the required differential-mode (DM) operation with suppressed common-mode (CM) transmission, the SIRs were designed to have the same odd-mode, but different even-mode, resonant frequencies. For that purpose, the two inner SIRs were loaded at the center with T-shaped open stubs of different dimensions so that their even-mode resonant frequencies are shifted away from those of the outer SIRs and that their odd-mode ones remain almost intact. For the fabricated prototype BPF, the measured minimum DM insertion losses for the first and second bands are 2.4 and 2.82 dB, respectively, whereas the measured CM insertion loss is larger than 25 dB in 17 GHz.

Original languageEnglish
Article number5392984
Pages (from-to)70-72
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume20
Issue number2
DOIs
Publication statusPublished - 2010 Feb 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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