Superconducting 8-Pole Tunable Quasi-Elliptic Function Filter on Sapphire Substrate

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

IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.8   pp.1635-1641
Publication Date: 2003/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
tunable filter,  high-Tc superconductor,  sapphire,  quasi-elliptic function filter,  

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We have developed a 2 GHz band superconducting 8-pole tunable quasi-elliptic function filter on sapphire substrate. The tunable filter has a sharp skirt characteristic by transmission zeros. And the tunable filter uses a low-cost substrate of sapphire. An adjustment of center frequency for the filter is realized by a tunable technique with a piezoelectric bending actuator. The tunable filter realized center frequency shift of 7.62 MHz with conditions of bandwidth change of 0.5% and ripple change of 0.25 dB. Center frequency of the 8-pole quasi-elliptic function filter agreed with the designed value. Given these features, a superconducting filter with a sharp skirt characteristic for next-generation mobile RF applications is expected to be realized by applying these filters.