A wideband CPS bandpass filter with ultra-wide upper stopband using stepped-impedance rat-race hybrid couplers

Chun Hsiang Chi*, Chi-Yang Chang

*Corresponding author for this work

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

4 Scopus citations

Abstract

A wideband coplanar strip (CPS) bandpass filter using two 3-dB stepped-impedance rat-race hybrid couplers is proposed in this paper. The stepped-impedance structure results in both ultra-wide upper stopband and size reduction. The low impedance and high impedance CPS lines are realized using the interdigital structure for low impedance and conventional structure for high impedance, respectively. The ideal phase inverter has been implemented with hybrid CPS/interdigital CPS structure. Experimental results show that this 2-GHz fifth order filter depicts a 10-dB return loss bandwidth of 100% and upper stopband rejection levels of better than -40dB up to 17.5 GHz. This proposed filter achieves wide passband and ultra-wide stopband performance simultaneously. This filter is fabricated using CPS on 15-mil Al 2O3 substrate with a dielectric constant of 9.8. The measured results agree well with the simulated results.

Original languageEnglish
Title of host publication2007 IEEE MTT-S International Microwave Symposium Digest
Pages735-738
Number of pages4
DOIs
StatePublished - 2 Oct 2007
Event2007 IEEE MTT-S International Microwave Symposium, IMS 2007 - Honolulu, HI, United States
Duration: 3 Jun 20078 Jun 2007

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X

Conference

Conference2007 IEEE MTT-S International Microwave Symposium, IMS 2007
CountryUnited States
CityHonolulu, HI
Period3/06/078/06/07

Keywords

  • Coplanar strip (CPS)
  • Interdigital coplanar strip
  • Phase inverter
  • Stepped-impedance
  • Wideband bandpass filter

Fingerprint Dive into the research topics of 'A wideband CPS bandpass filter with ultra-wide upper stopband using stepped-impedance rat-race hybrid couplers'. Together they form a unique fingerprint.

  • Cite this

    Chi, C. H., & Chang, C-Y. (2007). A wideband CPS bandpass filter with ultra-wide upper stopband using stepped-impedance rat-race hybrid couplers. In 2007 IEEE MTT-S International Microwave Symposium Digest (pp. 735-738). [4263923] (IEEE MTT-S International Microwave Symposium Digest). https://doi.org/10.1109/MWSYM.2007.380044