Improved Accuracy Combined Source and Magnetic Field Integral Equations with Low-Order Discretization

A low-order discretization scheme for the magnetic field integral equation (MFIE) with considerably improved accuracy is discussed and analyzed. The formulation is based on the classical form of the MFIE discretized with Rao-Wilton-Glisson functions and introduces weak-form basis transformations, which have recently been employed with great success within the context of the so-called combined source integral equation. Only the identity operator discretization, which is known to be a major error source, is modified in order to obtain highly accurate solutions. Numerical results are given to corroborate the effectiveness of the new scheme.