Estudio de la propagación electromagnética en guía de onda rectangular parcialmente llena de medios bi-isótropos

Abstract

This paper reviews the different formulations of the coupled mode method (CMM) that have been used in the literature for computing the propagation constants and the electromagnetic field in uniform waveguides in the propagation direction. These formulations are the EH-indirect and EHdirect formulations. We outline the main characteristics of these formulations and point out the reasons underlying their accuracy. The results of both formulations are compared and it is found that the EH-indirect formulation gives better results than the EHdirect one for rectangular waveguides partially loaded with biisotropic media. When the EH-indirect or EH-direct formulations of the CMM are combined with the classical Mode Matching Method (MMM) a hybrid technique is obtained that is capable of solving three dimensional (3D) discontinuities without restriction in number. The results of the generalized scattering matrix for the two formulations are compared and it is concluded that the indirect formulation gives more accurate results than the direct formulation.