基于双螺旋谐振器的UHF(超高频)低频段窄带高温超导滤波器设计  

COMPACT SUPERCONDUCTING NARROWBAND FILTER AT UHF BAND USING TWIN-SPITAL RESONATORS

作　　者：金世超[1] 魏斌[1] 张晓平[1] 曹必松[1] 彭慧丽[1] 朴云龙[1] 郭旭波[1] 

机构地区：[1]清华大学物理系,北京100084

出　　处：《低温物理学报》2008年第3期209-212,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:60471001)资助课题~~

摘　　要：由于弱耦合要求和基片尺寸限制,相对带宽小于0.5%的UHF低频段（～500MHz）窄带高温超导滤波器一直是滤波器设计制作中的难点.本文应用双螺旋弱耦合谐振器设计制作了中心频率为500MHz,相对带宽为0.4%的窄带高温超导滤波器.通过采用80m微带线宽工艺,六节滤波器尺寸仅为28mm 8mm.测量结果表明,未经调谐,通带内最小和最大插损分别为0.12dB、0.46dB,反射损耗小于-13.9dB;带边陡峭度为34dB/MHz,带外抑制为70dB.设计及测试结果表明,双螺旋谐振器比较适用于低频窄带滤波器的设计.Due to the requirement of weak coupling and the substrate size limitation, it is still difficult to design and fabricate high temperature superconducting （HTS） filter with a fractional bandwidth narrower than 0. 5% at ultra high frequency （UHF） band. Using the twin - spiral resonators, in this paper, we have presented the design and performance of a 6-pole HTS filter centered at 500 MHZ with a 0. 4% bandwidth. With the 80 m-microstrip-width technology, the filter pattern size is only 28 mm 8 mm. The measurements show that the minimum and maximum insertion losses are 0. 12 dB, 0. 46 dB, respectively. The return loss is better than - 13. 9 dB, and the out-of-band rejection is 70 dB. Therefore, it is indicated that twin-spiral resonator with 80 m-microstrip-width is suitable to design narrow band HTS filter at low frequency side of UHF band.

关 键 词：高温超导 滤波器 窄带 谐振器 

分 类 号：TN713[电子电信—电路与系统] TN629.1