移动通信用高性能高温超导滤波器的研制

High performance of HTS filter for mobile communication system

研制了用于移动通信系统的高性能高温超导滤波器。设计了一个由12节H形谐振器组成的超导滤波器,采用LaAlO3基片,厚度为0.518mm,介电常数为23.75,尺寸为38.6mm×25.8mm。滤波器制备采用了光刻技术和氩离子束刻蚀工艺,经封装检测后得到了优异的微波性能,其中心频率是830.5MHz,带宽11MHz,插入损耗<0.2dB,反射损耗>15.6dB,带外抑制>75dB,与设计结果符合得很好,优于实际应用的要求。

An excellent performance of high temperature superconducting（HTS） filter for mobile communication system is present.An HTS filter which composed of twelve-pole H-type resonators was designed with a size of 38.6mm×25.8mm on a 0.518mm thickness LaAlO3 substrate,the dielectric constant is 23.75.The physical properties show the HTS film has good performance characteristics.The fabrication process adopted photolithography and ion etching.The measured results of the filter matched well with the simulated ones and show high performances better than the practical application demands.The center frequency is 830.5MHz,the bandwidth is 11MHz,the insertion loss is less than 0.2dB,the return loss is better than 15.6dB,and the out band rejection is higher than 75dB.