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HIGH POWER FERRITE PHASE SHIFTER
ADVANCED TECHNOLOGY CORP TIMONIUM MD
Theoretical and experimental investigations of the microwave properties of ferrites at magnetic fields above ferromagnetic resonance are described. The program goal is the development of high power reciprocal phase shifters for X-band and C-band operation. The principal experimental objective is to demonstrate that ferromagnetic losses do not increase with the application of high RF power as typically observed for operations at magnetic fields below resonance. Insertion losses are given as a function of magnetic field strength for samples of nickel-zinc ferrite, manganese-magnesium ferrite and yttrium-iron garnet in a longitudinally magnetized rod configuration. Insertion loss and phase shift characteristics for oriented uniaxial ferrites are given. The material investigated was Ni 8Zn 2Co 02W, a ferrite having a hexagonal crystal structure. It was established that uniaxial ferrites would not be suitable for the subject application because of poor figures of merit. A derivation of the complex susceptibility for ferromagnetic materials and a set of generalized curves for rod geometries with longitudinal magnetic fields are given.
Semiannual technical rept.
Sponsored in part by the DARPA.
Approved for public release; distribution is unlimited.
Contract Number 2: