High-Tc Superconducting Sharp Skirt Tunable Filters

Hiroyuki FUKE  Yoshiaki TERASHIMA  Fumihiko AIGA  Mutsuki YAMAZAKI  Hiroyuki KAYANO  Tatsunori HASHIMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.3   pp.704-707
Publication Date: 2002/03/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Microwave Devices and Systems
superconducting device,  microwave filter,  sapphire substrate,  mechanical tunable filter,  

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We developed a compact rf receiver subsystem using a high-Tc 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 YBa2Cu3Oy thin films deposited on a LaAlO3 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.