Theory of Linear Ferrite Devices for Microwave Applications

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Abstract
Linear ferrite devices for microwave applications include phase shifters, switches, isolators, circulators, and others whose operation is independent of the applied rf signal level. In this paper, propagation through an infinite ferrite medium is treated first, and points of operation for various ferrite devices are established on a normalized plot of effective permeability vs biasing field. Transfer matrix techniques are used to analyze slab configurations with transverse magnetization, such as those found in differential phase shifters for circulators, field-displacement isolators, and certain latching phase shifters. These techniques permit computation of optimum geometry, field configurations, phase shift, and cutoff conditions. Suhl and Walker's analysis of the completely filled cylindrical waveguide is applied to the ferrite-filled coaxial line and extended to study Faraday rotation, phase shift, and cutoff conditions in cylindrical rod geometries. Of particular interest is a simplified analysis of the Reggia-Spencer phase shifter which predicts frequency dependence and critical geometry with good accuracy.

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