A high-performance ultra-narrow bandpass HTS filter and its application in a wind-profiler radar system

This paper reports a recent development of a narrowband high-temperature superconducting (HTS) bandpass filter with a fractional bandwidth of 0.35% in the L band. The filter exhibits a 10-pole quasi-elliptic function response implemented with a cascaded quadruplet coupling structure. The measured fi...

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Bibliographic Details
Published in:Superconductor science & technology 2006-05, Vol.19 (5), p.S398-S402
Main Authors: Li, Chunguang, Zhang, Qiang, Meng, Qingduan, Sun, Liang, Huang, Jiandong, Wang, Yunfei, Zhang, Xueqiang, He, Aisheng, Li, Hong, He, Yusheng, Luo, Sheng
Format: Article
Language:English
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Summary:This paper reports a recent development of a narrowband high-temperature superconducting (HTS) bandpass filter with a fractional bandwidth of 0.35% in the L band. The filter exhibits a 10-pole quasi-elliptic function response implemented with a cascaded quadruplet coupling structure. The measured filter shows a midband insertion loss of 0.26 dB and a return loss better than -15 dB over the passband. Steep rejection slopes are obtained at the band edges and the measured skirt slope has exceeded 120 dB MHz-1, resulting in an excellent out-of-band rejection very close to the band-edge. Combining this filter together with a special designed low-noise amplifier (LNA) as well as a cryo-cooler, an HTS subsystem was then constructed and mounted in the front end of a wind-profiler radar system, substituting the corresponding conventional parts. A field trial has shown that the HTS filter could markedly improve the sensitivity as well as the anti-interference capability of a wind-profiler radar system.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/19/5/S49