AN HTS FILTER SUBSYSTEM FOR 800MHz MOBILE COMMUNICATION SYSTEM

Abstract

In this paper, we present a high temperature superconducting (HTS) Filter subsystem, which consists of a 14-pole HTS filter, a low noise amplifier (LNA), a Stirling Cooler and an electronic control system. The HTS filter has a 2.1% fractional bandwidth at 814MHz. It was fabricated on MgO substrate which was double sides coated with YBCO thin films. The insertion loss of the HTS filter is less than 0.2 dB , the gain of the subsystem is 22 dB at 60K . In this subsystem, the out-of-band rejection is better than 70 dB and the steepness of the band-edges is larger than 25 dB/MHz at 60K .

Progress on applications of high temperature superconducting microwave filters

“…In China, a group from Tsinghua University has developed an HTS receiver consisting of two HTS channels for Code Division Multiple Access (CDMA) communication systems [95]. Each channel consists of a 14-pole HTS bandpass filter and an LNA.…”

The high temperature superconducting filters and its application progress

“…在中国, 清华大学针对码分多址(code division multiple access, CDMA)通信标准研发了两通道的高 温超导接收机 [95] , 每个通道都包含一个14阶的超导 带通滤波器和低噪声放大器. 该超导接收机首先在 天津的一个CDMA基站进行了试验 [96] , 取得了良好 效果.…”

Enabling High-Temperature Superconducting Technologies Toward Practical Applications

“…The Tsinghua University group has designed and fabricated a 14-pole HTS bandpass filter for code-division multiple access (CDMA) communication systems [123]. The HTS filter subsystem is installed in a CDMA base station in urban area of Tianjin as first field trial of the HTS filter subsystem on a single CDMA base station (BTS) [124].…”