Superconducting variable phase shifter using SQUID's to effect p

Details Superconducting variable phase shifter using SQUID's to effect p Superconducting variable phase shifter using SQUID's to effect p

1990-09-17

1992-10-06

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505701, 505702, 505866, 505874, 333161, 333164, 333 99S, H01P 118, H01L 3922

Patent

active

051531712

ABSTRACT:
A superconducting variable phase shifter providing improved performance in the microwave and millimeter wave frequency ranges. The superconducting variable phase shifter includes a transmission line and an array of superconducting quantum interference devices (SQUID's) connected in parallel with and distributed along the length of the transmission line. A DC control current I.sub.DC varies the inductance of the individual SQUID's and thereby the distributed inductance of the transmission line, thus controlling the propagation speed, or phase shift, of signals carried by the transmission line. The superconducting variable phase shifter provides a continuously variable time delay or phase shift over a wide signal bandwidth and over a wide range of frequencies, with an insertion loss of less than 1 dB. The phase shifter requires less than a milliwatt of power and, if one or more of the Josephson junctions fails, the whole device remains operational, since the SQUID's are connected in parallel.

REFERENCES:
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Zimmerman, J. E. et al., "Operation of a Y-Ba-Cu-O RF SQUID at 81.degree. K" NBS Paper Submitted to Applied Physics Letters; 1987.

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