3D hp-Adaptive Finite Element Simulations of a Magic-T Electromagnetic Waveguide Structure

This paper employs a 3D hp self-adaptive grid-refinement finite element strategy for the solution of a particular electromagnetic waveguide structure known as Magic-T. This structure is utilized as a power divider/combiner in communication systems as well as in other applications. It often incorporates dielectrics, metallic screws, round corners, and so on, which may facilitate its construction or improve its design, but significantly diíñcult its modeling when employing semi-analytical techniques. The /z/7-adaptive finite element method enables accurate modeling of a Magic-T structure even in the presence of these undesired materials/geometries. Numerical results demónstrate the suitability of the /z/7-adaptive method for modeling a Magic-T rectangular waveguide structure, deliveríng errors below 0.5% with a limited number of unknowns. Solutions of waveguide problems delivered by the self-adaptive hp-FEM are comparable to those obtained with semi-analytical techniques such as the Mode Matching method, for problems where the latest methods can be applied. At the same time, the /z/7-adaptive FEM enables accurate modeling of more complex waveguide structures.