| VHF波段超窄带超导滤波器的设计及其时域调谐 |
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| 引用本文： | 卢新祥,彭慧丽,郭旭波,张晓平,魏斌,曹必松.VHF波段超窄带超导滤波器的设计及其时域调谐[J].低温物理学报,2010(3). |
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| 作者姓名： | 卢新祥 彭慧丽 郭旭波 张晓平 魏斌 曹必松 |
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| 作者单位： | 清华大学物理系; |
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| 基金项目： | 国家自然科学基金(项目编号:60871004)资助课题~~ |
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| 摘 要： | 低频超窄带滤波器要求谐振器间的耦合极弱,设计受到薄膜面积限制,其性能对基片介电常数的均匀性极为敏感且受制作和封装精度的限制.这些因素将导致的滤波器中心频率偏移和带内性能恶化.对此,时域调谐提供了很好的解决途径.我们采用嵌套双螺旋型谐振器,在37mm×12mm的MgO基片上设计制作了4节超导滤波器,中心频率为166.9 MHz,相对带宽仅为0.29%.由于基片厚度或介电常数的偏差及不均匀性会导致滤波器中各谐振的谐振频率偏移,使通带性能受到很大影响.我们提出了将机械调谐与时域分析相结合的方法,通过机械调谐纠正各谐振器的谐振频率,改善滤波器性能.同时为了解决多信道滤波器系统中,各滤波器工作于同一温度下,系统频率一致性问题,通过时域调谐获得频率可调范围信息.对上述0.5 MHz带宽的VHF波段滤波器应用时域调谐方法,得到的可调范围为0.7 MHz,测试结果表明该滤波器具有优异性能,带内插损小于0.4 dB,反射损耗达到14.8 dB,带外抑制大于-70 dB.
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| 关 键 词： | 高温超导滤波器 超窄带 时域调谐 |
ULTRA-NARROWBAND SUPERCONDUCTING FILTER:DESIGN AND TUNING |
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| LU Xin-xiang PENG Hui-li GUO Xu-bo ZHANG Xiao-ping WEI Bin CAO Bi-song.ULTRA-NARROWBAND SUPERCONDUCTING FILTER:DESIGN AND TUNING[J].Chinese Journal of Low Temperature Physics,2010(3). |
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| Authors: | LU Xin-xiang PENG Hui-li GUO Xu-bo ZHANG Xiao-ping WEI Bin CAO Bi-song |
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| Affiliation: | LU Xin-xiang PENG Hui-li GUO Xu-bo ZHANG Xiao-ping WEI Bin CAO Bi-song Department of Physics,Tsinghua University,Beijing 100084 |
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| Abstract: | This paper presents the design and performance of a 4-pole superconducting filter consisting of halfwavelength bidirectional winding spiral resonators.The filter is designed with a 0.5 MHz bandwidth at 166.9 MHz. A mechanical tuning method for tuning the center frequency of a narrowband high temperature superconducting (HTS) filter is adopted.Tuning is carried out based on the time domain response of filter return loss.The filter can be precisely tuned to a desired center frequency while maintaining a high ... |
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| Keywords: | high temperature superconducting(HTS) filter microstrip ultra-narrowband tune |
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