It is well-known that if an E-field integral equation or an H-field integral equation is applied alone in analysis of EM scattering from\na conducting body, the solution to the equation will be either nonunique or unstable at the vicinity of a certain interior frequency.\nAn effective math model is presented here, providing an easy way to deal with this situation. At the interior resonant frequencies,\nthe surface current density is divided into two parts: an induced surface current caused by the incident field and a resonance surface\ncurrent associated with the interior resonance mode. In this paper, the presented model, based on electric field integral equation\nand orthogonal modal theory, is used here to filter out resonant mode; therefore, unique and stable solution will be obtained.The\nproposed method possesses the merits of clarity in concept and simplicity in computation. A good agreement is achieved between\nthe calculated results and those obtained by other methods in both 2D and 3D EM scattering.
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