Narrow-band HTS filter on sapphire substrate

Narrow-band HTS filter on sapphire substrate
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DOI：
10.1109/mwsym.2004.1339178
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发表时间：
2004-06
期刊：
2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)
影响因子：
--
通讯作者：
Jiasheng Hong;E. McErlean
Jiasheng Hong;E. McErlean
中科院分区：
其他
文献类型：
--
作者：
Jiasheng Hong;E. McErlean

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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 0.43 mm-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.