A MoM Model Based on Potential Integral Equations for Accurately Computing Electromagnetic Scattering by Imhomogenous Dielectric Cylinder

The main characteristic of potential integral equations is that it use electromagnetic potentials as unknowns.Becourse these unknowns are continuous at interfaces between regions of different permittivities and/or permeabilities,high order interpolation basis functions can be easily appllied in the method of moments. But classical point matching scheme is not numerically stable in this discretized model.In this paper,a model using potential integral equations for electromagnetic scattering of penetrable cylinders is proposed.The resulting coupled potential integral equations system is solved by the method of moments in combination with high order interpolation bases in triangle elements and improved matching approach.The new scheme avoids the numerical unstability of the original discretized model.The method for handling the singularity of the self-impedance element in MoM matrix is also presented.The numerical result shows the RCS of 2-D dielectric cylinder can be computed accurately by the proposed method.