Abstract
A perturbation formalism has been developed which treats an inhomogeneously loaded waveguide containing ferrites and dielectrics quantitatively. The treatment has been applied to single and double toroidal phase shifters and a tunable electrooptic modulator. The agreement between theory and experiment for the toroids is within a few percent over a broad bandwidth. The theory can treat the coupling to higher order modes and the analysis of the waveguide impedances.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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