APPLIED-FIELD FREQUENCY DEPENDENCY OF PROPAGATION IN AXIALLY MAGNETIZED FERRITE WAVE-GUIDES

Vector finite element solvers are used to calculate phase constants an d cutoff wave numbers in waveguides containing axially magnetized ferr ite media. For phase constant calculations, ferrite characteristics ar e specified in terms of the applied field, frequency, and material cha racteristics including saturation magnetization and data from the hyst eresis curve. Periodic boundary conditions are used with both finite e lement formulations to improve efficiency by reducing the size of the meshed region. Cutoff planes and phase shifts have been calculated for two examples, a Reggia-Spencer phase shifter and a ridged Faraday rot ation section. In each case comparisons are made with measured data in the literature. The ridged Faraday section was found to be multimoded over the design bandwidth. For completeness, the geometrical dependen cy of the cutoff plane in circular quadruply ridged waveguides is enun ciated and compared with available experimental results.