Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – High frequency waveguides – resonators – electrical networks,...
Patent
1994-08-16
1996-03-05
Lee, Benny T.
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
High frequency waveguides, resonators, electrical networks,...
505700, 505701, 505866, 333205, 333 99005, H01P 1203, H01B 1202
Patent
active
054967953
ABSTRACT:
The design of a high Tc superconducting band pass tunable ferroelectric filter (TFF) is presented. The band pass TFF consists of an edge coupled filter on a ferroelectric substrate. Each input and output microstrip line is a quarter wavelength long. Each intermediate microstrip line is a half wavelength long with the first quarter wavelength being coupled to the preceding microstrip line and the remaining quarter wavelength being coupled to the succeeding microstrip line. Each microstrip line is connected, through an LC filter, to a common bias voltage source. Application of a bias voltage changes the frequency of operation of the filter. For matching the impedances of the input and output of the filter to the impedances of an input and output circuit respectively, matching ferroelectric quarter wavelength transformers are provided.
REFERENCES:
patent: 5164358 (1992-11-01), Buck et al.
patent: 5258626 (1993-11-01), Suzuki et al.
patent: 5404119 (1995-04-01), Kim
Talisa, S. H., et al; "Low and High Temperature Superconducting Microwave Filters"; IEEE Trans on Microwave Theory and Techniques; vol. MTT-39; No. 9; Sep. 1991; pp. 1448-1454.
Jackson, C. M., et al., "Novel Monolithic Phase Shifter Combining Feroelectrics and High Temperature Superconductors"; Microwave and Optical Technology Letters; vol. 5, No. 14; 20 Dec. 1992; pp. 722-726.
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