High-Temperature Superconducting Microstrip Line Filter for Mobile Telecommunication(Special Issue on Superconductive Electron Devices and Their Applications)

概要

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Large-area High-temperature superconducting films and damage-free processing techniques have been developed to fabricate low insertion loss and sharp skirt filters for mobile telecommunication. An off-axis-type dc sputtering method was employed to deposit Y-Ba-Cu-O films on both sides of the substrate. The surface resistance of the films was about 0.35mΩ (at 70 K and 10 GHz). An 11-pole bandpass receiving filter for the IS-95 telecommunication system was designed and fabricated using 60mm×50mm YBCO films on a 0.5-mm-thick MgO substrate. The passband insertion loss at 70 K was about 0.1 dB with 0.1 dB ripple. The third-order intercept point of the filter was 49.5 dBm. We have assembled the filter and a low-noise amplifier in a dewar with a cryocooler. Ultralow-noise performance (noise figure: 0.5 dB at 70 K) was presented by the cryogenic filter subsystem.
社団法人電子情報通信学会の論文
1998-10-25