Integral equation formulation for modeling electromagnetic scattering from indented screens

The integral equation analysis of scattering from an indented screen or cavity structure has attracted much attention over the years, due to its special features and background in practical applications. We derive two integral equations using the equivalence principle and image theory, one of which is an integral equation of the second kind (Asvestas et al. (1994)). Another is an integral equation of the first kind. Both integral equations involve only current density on the cavity walls. Numerical results are shown in verifications of the two integral equations.