Patent ID: 6076001
Filing Date: 2000-06-13
Classification: H01P,Y10S

Abstract:
A ferroelectric variable time delay device having a single crystal ferroelectric material having an electric field dependent permittivity, a Curie temperature, a single crystal high Tc superconductor, and comprising:first, second, third layers;said first layer comprised of a single crystal dielectric substrate of a single crystalline form;said single crystalline form of a single crystal dielectric material provides a minimum dielectric loss;said second layer comprised of a film of a single crystalline form of said single crystal ferroelectric material being KTN, having said permittivity, deposited on said single crystal dielectric material of first layer;said single crystalline form of a ferroelectric material provides a dielectric loss, typically, of 0.035 dB per wavelength in the ferroelectric material;said third layer comprised of a film of a single crystalline form of said single crystal high Tc superconductor material deposited on said film of said single crystal ferroelectric material of second layer;said single crystalline form of said high Tc superconductor material provides a minimum conductive loss;said third layer being a spiral shaped symmetrical coplanar waveguide having arms, on both sides of a center arm;separation distances between said arm in the center and said arms on both sides of said center arm of said spiral being constant;said three arm spiral coplanar waveguide having 1, 2 . . . n turns;means for applying a bias voltage to said time delay device;a microprocessor for controlling said bias voltage, for a specific value of time delay, on command; andmeans attached to said time delay device, for operating the time delay device at a high superconducting temperature slightly above said Curie temperature of said ferroelectric material to avoid hysteresis.