Application and limits of the MoM-PO-UTD hybridization technique

Hybrid methods have gained in importance for the computation of electromagnetic problems. There are many reasons for this fact. Combining for example the transmission line method with a numerical technique provides the advantage that no line-specific gridding is required. The coupling into cables can be accomplished by computing the forcing terms of the telegrapher equations based on simplified full-wave models. Further examples are the computation or the shielding effectiveness by combining for example the method of moments (MoM) with an analytical solution. In this paper we consider a hybrid technique where the MoM is combined with physical optics (PO) and with the uniform geometric theory of diffraction (UTD). Such an approach involves a number of aspects which are attractive from a practical point of view. Certain rules, however, have to be considered in order to apply and to validate the method successfully in a numerical simulation.