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In connection with a high order method of moments solution of integral equations for electromagnetic scattering, several approaches are investigated for representing current and charge densities in the vicinity of corners. One approach uses the first N terms from the asymptotic solution for an infinite wedge to represent the current density. An alternative approach uses a traditional polynomial type of expansion, but augments it in the vicinity of corners with additional terms from the wedge result. The residual error obtained via the solution of an over-determined system of equations is used to judge the relative accuracy and efficiency of various approaches. [ABSTRACT FROM AUTHOR]

Modified magnetic field integral equations (MFIEs) are proposed incorporating a testing integration in the direction normal to the boundary of the target surface. The result involves a simpler kernel than the conventional MFIE, facilitating accurate computations. By employing a complex exponential testing function, the equations can be made immune to the interior resonance problem. The influence of the limits of integration, and the overall accuracy, is investigated using high order basis functions. [ABSTRACT FROM AUTHOR]