FERRITE-SUPERCONDUCTOR MICROWAVE PHASE SHIFTERS

Experimental ferrite phase shifters that utilize superconductor circui ts with very low conduction losses are described. Magnetic flux is con fined to a closed path, thereby avoiding deterioration of the supercon ducting properties that occurs when magnetic fields enter the supercon ductor. X-band differential phase shifters with meanderline circuits f abricated from niobium superconductors operated at 4 K have produced f igures of merit exceeding 1000 deg/dB. The designs are adaptable to hi gh-T-c superconductors.