Title :
Ferrite-superconductor devices for advanced microwave applications
Author :
Dionne, Gerald F. ; Oates, Daniel E. ; Temme, Donald H. ; Weiss, Jerald A.
Author_Institution :
Lincoln Lab., MIT, Lexington, MA, USA
fDate :
7/1/1996 12:00:00 AM
Abstract :
Microwave devices comprising magnetized ferrite in contact with superconductor circuits designed to eliminate magnetic field penetration of the superconductor have demonstrated phase shift without significant conduction 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 degrees of differential phase shift with a figure of merit exceeding 1000 degrees/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
Keywords :
ferrite circulators; ferrite phase shifters; high-temperature superconductors; magnetic microwave devices; microwave circulators; microwave phase shifters; superconducting microwave devices; HTSC; Nb; Nb meanderlines; T-junctions; X-band; YBCO meanderlines; YBaCuO; ferrite phase shifter; ferrite substrate; ferrite-superconductor devices; high-Tc superconductor; low-Tc superconductor; low-loss three-port switching circulator; magnetic field penetration elimination; magnetized ferrite; microwave applications; superconductor circuits; superconductor meanderline sections; three-fold symmetry; Ferrites; Josephson junctions; Magnetic circuits; Magnetic devices; Magnetic fields; Microwave circuits; Microwave devices; Phase shifters; Superconducting magnets; Superconducting microwave devices;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
