An automatic dual-surface approach for the solution of the electric field boundary integral equation in presence of interior resonances

The electromagnetic solution of surface integral equations for perfect conductors is not unique when the scatterer is a closed object and the frequency is an eigenfrequency of the interior cavity. A possible solution known in literature is the regularization of the problem through a dual surface approach. Here a simple and automatic procedure to discern closed and open portions of an arbitrary object, and properly placing the additional points for dual surface testing is presented, and combined with the dual surface approach.