ELECTROMAGNETIC SCATTERING ANALYSIS USING A MODEL OF DIPOLES LOCATED IN COMPLEX-SPACE

Fictitious current-models have been applied extensively in recent year s to a variety of time-harmonic electromagnetic wave scattering proble ms, This paper is introducing an extension of the current-model techni que which facilitates the solution to problems subsuming metallic scat terers whose periphery contains a variety of length-scales features. T his extension is in tune with the current-model technique philosophy o f using simple current sources the fields of which are analytically de rivable. It amounts to letting the coordinates of part of the source c enters assume complex values, Positioned in complex space, the simple current sources radiate beam-type fields which are more localized and are better approximations of the scattering by the smooth expanses of the structure, The coordinates of the other source centers can retain their conventional real values or have only a relatively small imagina ry constituent, These latter current sources are used to approximate t he fields in the vicinity of the more rapidly varying regions of the s tructure, The new approach is applied to analyze electromagnetic scatt ering by a perfectly conducting oblate spheroid. It is found to render the solution computationally more effective at the expense of only a slight increase in its complexity.