Balanced dual-band BPF with partially coupled bi-section λ/2 and λ/4 SIRs

Hung Chih Hsu, Ching-Her Lee, Chung I.G. Hsu, Pi Hung Wen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

A new fourth-order balanced dual-band bandpass filter (BPF) designed using partially coupled bi-section λ/2 and λ/4 stepped-impedance resonators (SIRs) is proposed. To obtain the required differential-mode (DM) operation, the BPF is arranged symmetric with respect to the plane of symmetry and all the SIRs are designed to have the same odd-mode resonant frequencies. The common modes of the balanced BPF which are indeed the even modes of the λ/2 SIRs are naturally suppressed since the λ/4 SIRs do not resonate at these frequencies. In addition, the lower-impedance sections of both the λ/2 SIRs and λ/4 SIRs are placed alongside to work as an all-stop coupled-line section in common-mode (CM) operation to achieve a good overall CM response. For the fabricated prototype BPF circuit, the measured minimum insertion losses for the first and the second bands in DM (CM) operation are 2.2 (16.6) and 2.56 (23.75) dB, respectively. The measured CM insertion loss is found greater than 52 dB over the displayed frequency range of 1-7 GHz other than the two DM passbands.

Original languageEnglish
Title of host publication2012 Asia-Pacific Microwave Conference, APMC 2012 - Proceedings
Pages244-246
Number of pages3
DOIs
Publication statusPublished - 2012 Dec 1
Event2012 Asia-Pacific Microwave Conference, APMC 2012 - Kaohsiung, Taiwan
Duration: 2012 Dec 42012 Dec 7

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC

Other

Other2012 Asia-Pacific Microwave Conference, APMC 2012
CountryTaiwan
CityKaohsiung
Period12-12-0412-12-07

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All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

Hsu, H. C., Lee, C-H., Hsu, C. I. G., & Wen, P. H. (2012). Balanced dual-band BPF with partially coupled bi-section λ/2 and λ/4 SIRs. In 2012 Asia-Pacific Microwave Conference, APMC 2012 - Proceedings (pp. 244-246). [6421560] (Asia-Pacific Microwave Conference Proceedings, APMC). https://doi.org/10.1109/APMC.2012.6421560