Electrically Tunable Superconducting Microstrip Line Band-Pass Filter for Mobile Applications

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

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.2   pp.221-225
Publication Date: 2005/02/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.2.221
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Superconducting Electronic Devices and Their Applications)
Category: Microwaves
Keyword: 
high-Tc superconductor,  tunable filter,  microstrip line filter,  interdigital electrode,  

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Summary: 
2 GHz band electrically tunable superconducting microstrip line band-pass filter was developed. The tunable filter used a thin interdigital electrode. The dielectric distribution of SrTiO3 substrate included a calculated nonlinear effect of the electrode and ferroelectric material. As a result, the tunable microstrip line filter design with interdigital electrode enabled calculation by the finite element method and the moment method. The tunable filter with a measured unloaded Q factor of 9700 and a frequency shift of 1.25 MHz was obtained.