P波段高温超导超宽带短截线滤波器设计与调谐方法研究  

DESIGN AND TRIMMING METHOD OF A P-BAND HTS ULTRA-WIDEBAND(UWB) FILTER USING SHUNT-STUB STRUCTURE

作　　者：陈炜[1] 郭旭波[1] 张晓平[1] 魏斌[1] 曹必松[1] 张盈[1] 卢新祥[1] 

机构地区：[1]清华大学物理系,北京100084

出　　处：《低温物理学报》2010年第5期343-345,共3页Low Temperature Physical Letters

基　　金：国家自然科学基金(批准号:60871004;60901002);高等学校博士学科点专项科研基金(批准号:200800030064)资助的课题

摘　　要：本文通过改进1/4波长短截线滤波器的结构,大幅减小了滤波器的尺寸.采用改进后的结构设计并制作了通带为250~480MHz的14节高温超导滤波器.在未经调谐的情况下,带内插损小于0.3dB,反射损耗大于10.9dB,带外抑制超过100dB,矩形系数达到1.3.为了实现更高的带内性能,本文提出了针对短截线型滤波器的调谐方法,调谐后滤波器的带内反射损耗改善了2.6dB,验证了本文提出的调谐方法的有效性.In this paper,an HTS UWB filter with passband from 250 MHz to 480 MHz is designed and fabricated. We improve the quarter-wavelength shunt-stub structure to reduce the filter size and make tuning feasible. Without tuning,the measured results show an insertion loss less than 0.3 dB,a return loss better than 10.9 dB,out of band rejection higher than 100 dB,and the rectangle coefficient of 1.3. After tuning,the in-band return loss is improved 2.6 dB. The results show that the tuning method is effective in improving the in-band performance of HTS UWB filter.

关 键 词：高温超导滤波器 超宽带 短截线 调谐 

分 类 号：TN713[电子电信—电路与系统]