Narrow-band HTS filter on sapphire substrate

Jia Sheng Hong, Eamon P. McErlean

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


This paper presents a narrow-band HTS bandpass filter on sapphire substrate for future mobile communications systems. The filter is designed to have a five MHz pass band in the UMTS base stations receive band. The filter exhibits a eight-pole quasi-elliptic function response implemented with a cascaded quadruplet coupling structure. The filter was fabricated on a 0.43mm-thick sapphire wafer with double-sided YBCO films. The measured filter showed a midband insertion loss of 0.5 dB at 1973 MHz and a return loss better than -15 dB over the pass band. It also exhibited an excellent rejection over the entire UMTS base station transmission band.

Original languageEnglish
Pages (from-to)1105-1108
Number of pages4
JournalIEEE MTT-S International Microwave Symposium Digest
Publication statusPublished - 2004
Event2004 IEEE MITT-S International Microwave Symposium Digest - Fort Worth, TX, United States
Duration: 6 Jun 200411 Jun 2004


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