Hybrid FEM/UTD analysis of the scattering from a cavity-backed aperture in a face of a perfectly conducting wedge

The analysis of the electromagnetic scattering from an inhomogeneously filled cavity in the face of a perfectly conducting wedge is accomplished by subdividing the original issue into two distinct simpler problems, by means of the equivalence principle. The exterior canonical problem is formulated by exploiting the Uniform Theory of Diffraction, while the more involved interior problem is treated by employing the Finite Element Method. The two solutions are subsequently joined by enforcing the continuity condition of the electromagnetic field components tangential to the cavity opening. The problem of non-physical interior resonances is addressed. Numerical results are presented for differently shaped inhomogeneously filled cavities.