Scattering analysis of multi-layered dielectric bodies of revolution-iterative method

For the EM problem of multi-layered dielectric bodies, the amounts of computer storage and computation time, which are required for moment method solution, is prohibitive. However, when the scatterer is rotationally symmetric, the amounts of computer storage and computation time can be considerably reduced. The EM scattering from a BOR (body of revolution) has been extensively studied by many researchers. Also, the exact solutions for the EM scattering problem of multi-layered dielectric spheres have been developed. On the other hand, the fictitious current model (FCM) has been applied to various EM scattering problems. Also this model has been successfully applied to the scattering problem of a conducting BOR (Hyung-Gi Na and Hyo-Tae Kim). Since in this method, both current sources and boundary condition testing are of point-form, the numerical procedure is simple and fast. In the present paper, the method of Hyung-Gi Na and Hyo-Tae Kim is extended to the EM scattering problem of multi-layered dielectric BORs. The boundary of each layer is assumed to be symmetric about its axis of rotation. However, the whole scatterer is not necessarily axisymmetric since the axes of rotation may be different from each other. Thus, in order to take advantage of the symmetry of each layer, the EM scattering of each layer is solved separately. After the EM problem is solved in the p-th boundary, the effects of the scattered field are added to neighboring boundaries. This procedure is repeated for every layer until the desired degree of accuracy is obtained.