Diffraction and scattering of electromagnetic waves by spheres with elliptic slit apertures and interior loading

An analytical method is presented for solving the problem of diffraction of electromagnetic waves by a perfectly conducting sphere with an elliptic slit aperture. The interior of the sphere is filled with two different media which are radially stratified. The treatment of this canonical shielding problem may provide a better insight into the coupling mechanism of electromagnetic waves through slit apertures in realistic shielding structures. The solution of this three-dimensional diffraction problem is based on the spherical multipole expansion of the electromagnetic field.