FERRITE-SUPERCONDUCTOR DEVICES FOR ADVANCED MICROWAVE APPLICATIONS

Microwave devices comprising magnetized ferrite in contact with superc onductor circuits designed to eliminate magnetic field penetration of the superconductor have demonstrated phase shift without significant c onduction losses. The device structures are adaptable to low- or high- T-C superconductors. A nonoptimized design of a ferrite phase shifter that employs niobium or YBCO meanderlines has produced over 1000 degre es of differential phase shift with a figure of merit exceeding 1000 d egrees/dB at X band, By combining superconductor meanderline sections with alternating T junctions on a ferrite substrate in a configuration with three-fold symmetry, a low-loss three-port switching circulator has been demonstrated.