A study on the scattering from a loaded spherical shell with an aperture

In this paper, numerical results for the scattering of a plane wave by an infinitely-thin multiloaded perfectly-conducting spherical shell with a circular aperture are studied in order to get an insight of the scattering characteristics of the considered structure. It is found that filling the spherical shell with a dielectric doesn't change its scattering characteristics compared to those of the spherical shell presented alone or the closed spherical cavity. However, the existence of the dielectric inside the spherical shell alters the electrical size of the spherical shell which reduces the backscattering cross section but is still frequency sensitive. When the dielectric medium is presented as a coating layer, the scattering characteristics of the spherical shell are affected and the backscattering cross section is in general high far this type of loading.