Some topics in the microwave application of gyrotropic media

The Faraday effect of plane and guided waves is reviewed in Sections I and II. Section III deals with a cavity technique for measuring Faraday rotations in a circular waveguide with a coaxial ferrite pencil. In Section IV some experimental results are discussed, including the evaluation of the permeability tensor components, the relation between Faraday rotation and pencil radius, and ferromagnetic resonance in circularly polarized waves. The problem of the rectangular gyrotropic waveguide is taken up in Section V. A simple method of successive approximations is described and applied to the case of the square waveguide.