Finite element solution of faraday rotation sections

To fully evaluate the propagation characteristics of a waveguide cross-section two types of calculations are required: the cut-off planes of the modes; the phase constant of any propagating modes at a specified frequency. A vector finite element solver has been developed which can be used for both types of calculations. It encompasses two known formulations which can be applied to axially magnetized gyromagnetic waveguides. To illustrate the usefulness of finite element analysis in the design of practical gyromagnetic waveguides, Faraday rotation sections for wideband applications are examined. Cut-off planes are calculated for both axi-symmetric and ridged gyromagnetic waveguides. The Faraday rotation angle is calculated for a uniform length of waveguide and compared with experimental values