Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – High frequency waveguides – resonators – electrical networks,...
Patent
1994-03-30
1995-09-19
Lee, Benny T.
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
High frequency waveguides, resonators, electrical networks,...
505700, 505701, 505866, 333 99005, 333161, H01P 118, H01P 900, H03H 1116, H01B 1202
Patent
active
054515670
ABSTRACT:
The high power ferroelectric RF phase shifter contains a ferroelectric material in a microstrip line section. Between the ferroelectric phase shifter and the input, there is a ferroelectric matching transformer. Between the ferroelectric phase shifter and the output, there is a quarter wave ferroelectric matching transformer. A bias field is connected across the top and bottom surfaces of the ferroelectric material. When a bias field is applied across the ferroelectric material, the permittivity is reduced and as such the velocity of propagation is increased. This causes an increase in the effective electrical length of the phase shifter. Increasing the bias voltage increases the phase shift. The ferroelectric RF phase shifter may be constructed of a ferroelectric liquid crystal (FLC). The ferroelectric material is operated above its Curie temperature.
REFERENCES:
patent: 5212463 (1993-05-01), Babbitt et al.
patent: 5307033 (1994-04-01), Koscica et al.
Jackson, C. M. et al., "Novel Monolithic Phase Shifter Combining Ferroelectrics and High Temperature Superconductors"; Microwave & Optical Tech Letters; vol. 5, No. 14, 20 Dec. 1992 pp. 722-726.
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