One unique property of Faraday rotation is that it is nonreciprocal. This means that a wave propagating in one direction which is rotated by an angle θ does not rotate back to its original position when it is returned to its starting point. It is therefore a suitable structure for the construction of nonreciprocal Faraday rotation devices such as circulators, phase shifters and isolators. It is also an appropriate prototype for a host of reciprocal power dividers and other components. Propagation in a dual mode triple ridge gyromagnetic waveguide is handled separately. One model of a Faraday rotation bit is a nonreciprocal 4-port directional coupler. The chapter includes the scattering matrix of the arrangement. A three-component magnetic field formulation of the sort of functional met in the Rayleigh-Ritz calculation of propagation in this type of waveguide is included separately. It is employed in the calculations of propagation of a number of the gyromagnetic waveguides addressed in this chapter. The descriptions of some typical nonreciprocal components are also given.

Inspec keywords: ridge waveguides; S-matrix theory; directional couplers; electromagnetic wave propagation; circulators; phase shifters; power dividers; microwave isolators; Faraday effect

Other keywords: Rayleigh-Ritz calculation; gyromagnetic quadruple ridge waveguide; dual mode triple ridge gyromagnetic waveguide; wave propagation; reciprocal power dividers; phase shifters; scattering matrix; three-component magnetic field formulation; isolators; nonreciprocal Faraday rotation devices; nonreciprocal 4-port directional coupler; circulators

Subjects: Waveguides and microwave transmission lines