ABSTRACT
This chapter considers electromagnetic scattering from spherical cavity structures that are more complicated than those encountered. It also considers electromagnetic plane wave scattering from two concentric spherical open shells. If the two spherical caps lie on a common spherical surface of specified radius, the diffraction problem is intrinsically more complex and is closely related to the diffraction problem for spherical barrels. The chapter analyses plane wave scattering from the perfectly conducting slotted spherical shell. It discusses the analysis of horizontal dipole excitation of the slotted shell or barrel has a similar level of complexity because of the coupling of TM and TE modes. The dipole excitation of a spherical cavity with two equal circular apertures symmetrically located is closely related to the problems studied. The apparent complexity of the solution presented is rewarded by a system of well-conditioned equations for which a stable numerical scheme of well- defined accuracy over a wide frequency range is easily implemented.
