An improvement on wave-function expansion analysis for EM scattering from a conducting body

The wave function expansion analysis for EM scattering is different from the boundary element integral equation method (BIEM) in principle. Several different procedures of wave-function expansion analysis have been suggested, which have been applied in many practical scattering problems. However, the expansion in these procedures are not complete near the boundary of the scatterer, it results in the error in modelling, especially about a sharp edge. An improved procedure for the scattering from a perfectly conducting body is proposed, in which a complete expansion combining with the finite difference scheme is used for the scattered fields from an arbitrary conducting body including sharp edges. Some numerical results verify the effectiveness of this improvement.