Low-Frequency Scattering of a Spherical Wave due to an Arbitrary Dipole by a Sphere

摘要

A homogeneous dielectric sphere is excited by an internal dipole with arbitrary polarization and lying at an arbitrary location. The electric far-field pattern is determined analytically by applying a dyadic Green's function technique. Then, the derived exact far-field results are approximated in the low-frequency regime yielding simplified expressions which are expected to be utilized in inverse scattering problems concerning the determination of the scatterer's and the dipole's parameters.