一种免调谐窄带高温超导滤波器  

A NARROWBAND HIGH-TEMPERATURE SUPERCONDUCTING FILER REQUIRED NO TUNING

作　　者：崔彬[1] 张雪强[1] 边勇波[1] 王佳[1] 郭进[1] 何晓锋[1] 李春光[1] 张强[1] 黎红[1] 何豫生[1] 

机构地区：[1]中国科学院物理研究所,北京100190

出　　处：《低温物理学报》2010年第3期178-180,共3页Low Temperature Physical Letters

摘　　要：研制了一种适用于超导子系统接收机前端的免调谐窄带高温超导滤波器.其中心频率为2287 MHz,带宽为8 MHz.该高温超导滤波器采用了10阶准椭圆(quasi-elliptic)函数型结构,并引入了2对改善带边陡度的传输零点.滤波器的计算机仿真是用Sonnet软件完成的.为了达到免调谐的目的,选用了一种结构简单的"双折线型"谐振器.此滤波器是在直径为2英寸、厚度约为0.5mm MgO衬底的双面超导薄膜上制作的.测量结果表明,该滤波器在未经调谐的情况下具有很好的性能:相对带宽0.35%,带外抑制>80 dB,插入损耗<0.2 dB,反射损耗<-15.5dB(通带7MHz范围之内).A narrowband high-temperature superconducting（HTS） filter required no tuning which is used in the front of a superconducting subsystem is fabricated and measured.The filter has a center frequency of 2287 MHz with a bandwidth of 8 MHz.The filter was implemented by a 10-pole quasi-elliptic function response filter with two pairs of transmission zeros（for high selectivity）.The simulation progress of the filter was carried out by Sonnet software.We selected a＂double-folded＂resonator,which has a simple structure to realize the purpose of required no tuning.The filter was fabricated on a 2-inch,0.5 mm MgO wafer with double-sided YBCO films.The measured results exhibit high performances：the fractional bandwidth is 0.35%;the out-of-band rejection is larger than 80 dB;the insertion loss is less than 0.2 dB and the return loss is better than—15.5 dB（in a 7 MHz range of the passband）.

关 键 词：高温超导 窄带 免调谐 

分 类 号：TN713[电子电信—电路与系统]