Design and performance of a compact forward-coupled HTS microstrip filter for a GSM system

Research output: Contribution to journalArticle


  • MH Zhu
  • BS Cao
  • WJ He
  • XB Guo
  • S He
  • Bin Liu
  • YG Zhao
  • ML Liu
  • ZH Han
  • BX Gao

Colleges, School and Institutes


A practical design technique for a compact forward-coupled microstrip bandpass filter structure is introduced based on a computer-aided simulation and optimization software TUMIC. The structure consists of a parallel array of fully aligned half-wavelength resonators. Aimed at the application in the front-end receiver of a GSM base station, a 9-pole high-temperature superconductor filter with 2.6% fractional bandwidth at 1732.5 MHz was designed and fabricated using double-sided YBCO thin films on a 30-mm x 30-mm X 0.5-mm LaAlO3 wafer. The S-parameter measurements show a good agreement with the simulated results. At 30 K, the filter has less than 0.4-dB insertion loss, 0.3-dB passband ripple, and better than 12-dB return loss.


Original languageEnglish
Pages (from-to)1897-1901
Number of pages5
JournalIEEE Transactions on Applied Superconductivity
Issue number4
Publication statusPublished - 1 Dec 2002


  • microstrip bandpass filter, high-temperature superconductor (HTS), wireless communications