A Superconducting Wide-Band Filter Subsystem with Improved Out-of-Band Performance
首发时间:2012-02-14
Abstract:A High-temperature superconducting (HTS) wide-band filter subsystem, consisting of an HTS filter and a cryogenic low noise amplifier (CLNA), is presented. The HTS filter at 480 MHz with an 86 MHz bandwidth is designed using stepped impedance resonators to achieve a high out-of-band performance and a compact size. The deterioration of the out-of-band rejection after cascading the HTS filter with the CLNA is addressed and solved. The measurements of the filter subsystem, without any tuning, exhibit an excellent performance. The gain is 16.3 ± 0.2 dB, the noise figure is less than 0.35 dB, and the return loss is better than 15.6 dB. The out-of-band rejection is over 78 dB up to 1230 MHz, which is 2.6 times of the filter's center frequency.
keywords: Filter subsystem cryogenic amplifier (CLNA) superconducting filter wide-band
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宽带高温超导滤波子系统带外抑制特性提高方法研究
摘要:由高性能超导滤波器和低温低噪声放大器组成的超导滤波子系统是提高无线通信接收机灵敏度和抗干扰能力的重要手段。本文采用阻抗阶跃结构谐振器设计并制作了中心频率为480 MHz、带宽为86 MHz的具有良好带外抑制特性和紧凑结构的宽带高温超导滤波器,分析了由超导滤波器和低温低噪声放大器级联构成超导滤波子系统后带外抑制特性恶化的原因,并通过在低温低噪声放大器电路中增加并联谐振电路以产生传输零点的方法来提高超导滤波子系统的带外抑制特性。超导滤波子系统未经调谐的测试结果表现出良好的性能,其测试增益为16.3±0.2 dB,噪声系数小于0.35 dB,反射系数好于15.6 dB,带外抑制优于78 dB。
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