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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 tunable narrow-band high-temperature superconducting filter suitable for the front end of superconducting sub-system receiver has been developed with a center frequency of 2287 MHz and a bandwidth of 8 MHz. The high-temperature superconducting filter uses quasi- elliptic) functional structure and introduced two pairs of transmission zeros to improve the edge steepness.The computer simulation of the filter was done by Sonnet software.In order to avoid the purpose of tuning, we chose a simple structure of “ This filter was fabricated on a double-sided superconducting thin film with a 2 ”diameter and a thickness of about 0.5mm MgO substrate.The measurement results show that the filter has very good tunability Good performance: 0.35% relative bandwidth,> 80 dB out-of-band rejection, <0.2 dB insertion loss and <-15.5 dB reflection loss (within 7MHz pass band).