Title :
Tuning properties of 2 GHz superconducting microstrip-line filters
Author :
Fuke, H. ; Terashima, Y. ; Kayano, H. ; Yamazaki, M. ; Aiga, F. ; Katoh, R.
Author_Institution :
Corp. Res. & Dev. Centre, Toshiba Corp., Kawasaki, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
We have fabricated a 2 GHz 12-pole superconducting microstrip line filter and a 2-pole electrically tunable filter using interdigital electrodes and dielectric film. The change of the dielectric constant of a SrTiO3 film, stacked on the filter, by applying a bias voltage between the electrodes leads to the tunability. The range of the center frequency modulation was 13 MHz (0.7%) at 60 K, 75 kV/cm. The microwave frequency response was improved by modification of the electrode structure. This tuning method is considered to be promising in that individual resonance elements in multi-pole filters can be tuned independently
Keywords :
barium compounds; circuit tuning; high-temperature superconductors; microstrip filters; microwave filters; superconducting filters; superconducting microwave devices; yttrium compounds; 2 GHz; 60 K; SrTiO3; YBa2Cu3O; bias voltage; center frequency modulation; dielectric constant; dielectric film; electrically tunable filter; interdigital electrodes; microwave frequency response; multi-pole filters; superconducting microstrip-line filters; tuning; Dielectric constant; Dielectric films; Electrodes; Frequency modulation; Microstrip filters; Microwave filters; Superconducting films; Superconducting filters; Superconducting microwave devices; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
