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, whic h has facilitated a more efficient solution to problems of metallic sc atterers whose periphery contains a variety of length-scales features, is applied to analyse scattering by penetrable bodies of similar shap e. In the extension of the current-model technique, the coordinates of part of the elemental source centres assume complex values. In this w ay, the fields radiated by these sources have a beam-shaped pattern an d 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 imagin ary constituent. The fields radiated by these sources are used to span the field scattered by the rapidly varying parts of the air-body inte rface. The suggested approach is applied to analyse electromagnetic sc attering by a penetrable oblate spheroid. It is found to render the so lution computationally more effective at the expense of only a slight increase in its complexity.