Abstract
The ridge waveguide is not in practice restricted to the rectangular waveguide with one or two ridges. One or more ridges have by now been introduced into circular, square and triangular waveguides. A property of the round or square waveguide symmetrically loaded by four ridges is that its dominant mode can be decomposed into counter-rotating circular polarised waves on its axis. This sort of ridge waveguide supports Faraday rotation provided it is perturbed by a gyromagnetic material along its axis. Since the dominant mode solution of this structure has two-fold symmetry it is sufficient, insofar as it is concerned, to investigate the problem regions revealed by introducing suitable orthogonal magnetic and electric walls in all combinations. Its mode nomenclature coincides with that of the round or square waveguide obtained by removing the ridges. The nodal finite element method (FEM) again provides one means of investigating this sort of isotropic waveguide. The effect of depositing dielectric tiles on the ridges is also given some attention.
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