On the regularization of the vector potential in the electric field integral equation

Integral equation (IE) based solvers for simulating radiation and scattering from perfect electrically conducting (PEC) structures have been receiving an increasing interest in the last decades. Among all integral equation solvers, the Electric Field Integral Equation (EFIE) solved with boundary elements is one of the most important approaches. In fact the EFIE is applicable to both open and closed structures, can handle geometries that include holes and junctions and, when combined with the Magnetic Field Integral Equation (MFIE) gives rise to the Combined Field Integral Equation (CFIE) which is free from spurious resonances.