A 3-D APPLICATION OF THE BYMOMENT METHOD FOR ELECTROMAGNETIC SCATTERING

One can find various mesh truncation techniques in the literature for the finite element solution of electromagnetic scattering problems. In this paper, a mesh truncation approach referred to as the three-dimen sional bymoment method is considered. This approach uses two z-directe d Hertz vector potentials instead of three Cartesian field components to formulate the relevant boundary conditions. The pertaining FEM fiel d solutions are calculated by treating the scattering problem as an in terior region problem. The FEM field solutions are then numerically '' coupled'' on a second boundary surface that is conformal to the first one and completely enclosed by it. The ''coupling'' procedure yields a set of expansion coefficients, with the help of which the total field solution is written as an appropriate linear combination of the inter ior region FEM field solutions.