Computational analysis of scattering by penetrable oblate spheroids using a model of dipoles located in complex space

The recently introduced extension of the current-model technique, which has facilitated a more efficient solution to problems of metallic scatterers whose periphery contains a variety of length-scales features, is applied to analyse scattering by penetrable bodies of similar shape. In the extension of the current-model technique, the coordinates of part of the elemental source centres assume complex values. In this way, the fields radiated by these sources have a beam-shaped pattern and they can better span the field scattered by the smooth parts of the air-body interface. The coordinates of the other source centres retain their conventional real values or have only a relatively small imaginary constituent. The fields radiated by these sources are used to span the field scattered by the rapidly varying parts of the air-body interface. The suggested approach is applied to analyse electromagnetic scattering by a penetrable oblate spheroid. It is found to render the solution computationally more effective at the expense of only a slight increase in its complexity