HTS narrow band filters at UHF band for radio astronomy applications
HTS narrow band filters at UHF band for radio astronomy applications
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DOI：
10.1109/tasc.2005.850170
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发表时间：
2005-06
影响因子：
1.8
通讯作者：
Jiafeng Zhou;Michael J. Lancaster;Frederick Huang;Neil Roddis;Dave Glynn
中科院分区：
文献类型：
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作者：
Jiafeng Zhou;Michael J. Lancaster;Frederick Huang;Neil Roddis;Dave Glynn
为了改善英国Jodrell Bank天文台对脉冲星的观测，需要高性能的窄带高温超导(HTS)滤光片，频率为610 MHz，具有非常尖锐的截止响应和低损耗。为此，设计了一种采用紧凑型谐振器的八极点准椭圆高温超导滤波器。测试结果表明，该滤波器的插入损耗为0.3d B(含0.2 d B纹波)，通带回波损耗为15 d B。实现了两个传输零点，提高了截止的陡度。最低的谐波被设计为出现在1.79 GHz，大约是中心频率的三倍。对于该次谐波，带外抑制优于85分贝。该滤光片已在天文台进行了测试，取得了良好的效果。
High performance narrow-band High-Temperature Superconductor (HTS) filters at 610 MHz with very sharp cut-off response and low loss are needed for improving the observation of pulsars at the Jodrell Bank Observatory, UK. An eight-pole quasi-elliptic HTS filter using compact resonators has been designed for this purpose. The measured response of filter has an insertion loss of 0.3 dB (including a 0.2 dB ripple), and a return loss of 15 dB in the passband. Two transmission zeroes are realized to improve the steepness of the cut-off. The lowest harmonic is designed to appear at 1.79 GHz, about three times the center frequency. The out-of-band rejection is better than 85 dB up to this harmonic. The filter has been tested in the observatory with excellent results.