High T.sub.c superconducting microstrip phase shifter having tap

Details High T.sub.c superconducting microstrip phase shifter having tap High T.sub.c superconducting microstrip phase shifter having tap

1993-05-17

1995-01-31

Lee, Benny T.

Superconductor technology: apparatus, material, process

High temperature devices, systems, apparatus, com- ponents,...

Photoconductive, light transmissive, light emissive, or...

505210, 505700, 505701, 505866, 333 99005, 333161, H01P 118, H01B 1200, H01L 3900

Patent

active

053858832

ABSTRACT:
The present invention is a superconducting opto-electronic phase shifter which is achieved by illuminating a superconducting microstrip line, which is fabricated on a dielectric substrate, with an optical beam of a predetermined intensity and shape. Because the superconducting microstrip will exhibit a local surface resistance when and where illuminated, the microstrip line will be artificially narrowed thereby producing a phase shift. This occurs because as the width of a superconducting microstrip line narrows the velocity of the carder signal increases. Therefore, if the illumination of the superconducting microstrip line causes a local surface resistance, then the surface impedance of the microstrip line is increased causing the effective width of the microstrip line to decrease. Hence, the artificial decrease in the width of the microstrip will cause the phase of the carrier signal to shift.

REFERENCES:
patent: 4675624 (1987-06-01), Rosen et al.
patent: 5116807 (1992-05-01), Romanofsky et al.
patent: 5208213 (1993-05-01), Ruby
patent: 5258626 (1993-11-01), Suzuki et al.
patent: 5285067 (1994-02-01), Culbertson et al.
Glass, N. E. and Rogovin, D.; "Optical Control of Microwave Propagation in uperconducting Devices"; Applied Physics Letters; vol. 54, No. 2; 9 Jan. 1989; pp. 182-184.

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