Session TU4D: Microwave Magnetic Devices

This session comprises seven papers covering recent developments in ferrite phase shifters, lumped element circulators, left-handed ferrite waveguides, microwave inductors and magnetostatic wave (MSW) oscillators. The stress related insertion loss in longitudinal field ferrite devices is analyzed and a method is suggested for screening ferrite rod samples to determine suitability for use in dual-mode phase shifters. A duplexing reciprocal phase shifter is described that integrates a circulator function into the phase shifter structure. Two papers discuss improvements to lumped element isolator and circulator designs through improved techniques and a novel gyrator circuit. A lefthanded periodic, ferrite-filled waveguide structure was modeled and fabricated. Measurements confirmed the existence of pass-bands below the waveguide cut-off frequency. Ferromagnetic RF integrated inductors are described that exhibit a record breaking Q 12 at 1GHz using soft CoNbZr films and closed magnetic circuits. Finally a novel regenerative detector using a MSW resonator is discussed that combines high sensitivity with simplicity and potentially low cost..