基于谐频交错的级联式超宽阻带超导滤波器  

An ultra-wide-stopband superconducting filter based on cascaded harmonics-staggered filters

作　　者：卢新祥[1] 郭旭波[2] 叶森钢[1] 余亚东[1] 王翔[2] 魏斌[2] 曹必松[2] Lu Xinxiang Guo Xubo Ye Sengang Yu Yadong Wang Xiang Wei Bin Cao Bisong(Department of Physics, Shaoxing University, Shaoxing 312000, China Department of Physics ,Tsinghua University, Beijing 100084, China)

机构地区：[1]绍兴文理学院物电系,绍兴312000 [2]清华大学物理系,北京100084

出　　处：《低温与超导》2017年第2期45-48,共4页Cryogenics and Superconductivity

基　　金：国家自然科学基金(61401282);绍兴市科技计划项目(2014B7002;2014B7001)资助

摘　　要：利用微带谐振器不同折叠方式引起电磁场分布差异从而产生交错谐频的效应,提出一种基于交错谐频的级联式超导带通滤波器设计方法,可以极大地拓宽滤波器的阻带范围。在YBCO/MgO高温超导基片上设计制作了中心频率为200MHz、相对带宽为0.25%的级联式超导滤波器。测试结果表明,该滤波器基频通带与9.1f_0处寄生通带之间的抑制度大于56d B,验证了该设计方法的有效性。Microstrip resonators with different folding structures have different electromagnetic fields, which make harmonics of the resonators differ from nfo. A novel design and optimization method based on cascaded superconducting band - pass filters with staggered harmonics was proposed. The upper stopband was widened up to 9. 1 f0. A ‘ 4 ＋ 2＇ - type cascaded superconduct- ing filter with a center frequency of 200MHz and a fractional bandwidth of 0.25% was designed and fabricated on YBCO/MgO HTS substrates. The measured stopband rejection between the fundamental passband and the parasitic mode at 9. 1 f0 was greater than 56dB, verifying the validness of the proposed method.

关 键 词：高温超导 滤波器 宽阻带 级联 

分 类 号：TN713[电子电信—电路与系统]