High-T_c Superconducting Sharp Skirt Tunable Filters(<特集>Special Issue on Superconductive Electronics)

概要

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We developed a compact rf receiver subsystem using a high-T_c superconducting sharp skirt band-pass filter with a center frequency tuning function. A 24-pole hairpin-type 2 GHz microstrip-line filter was fabricated with YBa_2Cu_3O_y thin films deposited on a LaAlO_3 substrate. Attenuation characteristics were more than 30 dB at 1 MHz apart from both the lower and the higher pass-band edges. For center frequency tuning, a 1-mm-thick dielectric sapphire plate was stacked on the filter, and the filtering characteristics were tuned by moving the plate using a piezoelectric bending actuator. The range of the center frequency modulation was more than 12 MHz with no degradation of the low-loss and sharp-skirt characteristics.
社団法人電子情報通信学会の論文
2002-03-01