A new benchmark is introduced for numerical solutions of transient or wideband electromagnetic scattering problems, and is applied to a time-domain integral equation (TDIE) solution scheme. The benchmark is based on a computation of the direct backscatter of a spherical cap reflector. This structure possesses a surface, an edge and a cavity, and fully tests the ability of the TDIE to model the mechanisms involved in scattering from an arbitrary metallic obstacle. A semi-analytic solution is obtained for the direct backscatter of a spherical cap reflector using an approach based on a method of regularization. A comparison is made of the numerical TDIE solutions with those accurately obtained by the semi-analytic regularization method; the TDIE approach is shown to model accurately all of the scattering mechanisms observed.
|Number of pages||8|
|Journal||Annual Review of Progress in Applied Computational Electromagnetics|
|Publication status||Published - 1999|