Abstract
Publisher Summary This chapter begins with the discussion of ferrite materials used for microwave applications. It addresses electromagnetic waves in a ferrite medium. A linearly polarized electromagnetic wave propagating along the direction of the static magnetic field in an infinite ferrite medium can be decomposed into two opposite rotating circularly polarized waves having different propagation constants. Exact expressions for the electromagnetic fields in ferrite-loaded waveguides are available only for a few simple geometries of rectangular and circular cylindrical waveguides. The chapter also provides an overview on ferrite phase shifters. Ferrite phase shifters are usually made as waveguide devices, but sometimes other configurations are met. The following characteristics are usually specified by manufacturers for ferrite phase shifters: differential phase shift, peak power, average power, bandwidth, VSWR, insertion loss, switching speed, and switching energy. The chapter also offers a detailed discussion on ferrite circulators and isolators, YIG devices, and ferrite switches. Ferrite switches usually employ switchable circulators.
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