L波段高性能双通带高温超导滤波器

A High-performance Dual-band High Temperature Superconducting Filter at L-Band

本文介绍了一款八阶高性能L波段双通带超导滤波器的研制过程。该滤波器基于中间枝节加载谐振器,采用适当展宽带宽并引入传输零点的方式来实现所需要的带边陡度和带内群时延要求。该滤波器采用2英寸的MgO衬底的双面YBCO薄膜通过光刻技术制作而成。测试结果表明,该滤波器的1 dB通带分别为1121~1321 MHz、1527~1648 MHz,滤波器在960 MHz和1900 MHz处带外抑制均大于60 dB,在1360~1460 MHz之间带外抑制均大于40 dB,带内任意20 MHz的群时延波动均小于4 ns。该滤波器包含接头的电路尺寸仅约19.02 mm×21.12 mm,测试结果与仿真结果基本一致,可以满足设计要求。

This paper introduces an 8-pole high performance dual-band high temperature superconducting filter at L-band.Based on the stub-loaded resonators(SLRs),broadening the bandwidth appropriately and introducing transmission zeros are used to meet the filter design requirements of band edge and group delay variation.The filter is fabricated on one side of double-side YBCO thin film with a 2-inch-diameter and 0.5-mm-thick MgO substrate by photolithography and ion etching technology.The measured results indicate that the 1 dB passband of the filter is 1121~1321 MHz and 1527~1648 MHz respectively.The out-of-band suppression is greater than 60 dB at 960 MHz and 1900 MHz.The out-of-band suppression is greater than 40 dB at 1360~1460 MHz.The group delay variation of any 20 MHz in the passband is less than 4 ns.The filter circuit size with the feeders is about 19.02 mm×21.12 mm.The measured results are basically consistent with the simulated ones,which can meet the design requirements.