Influence of MoM Test Integral Accuracy on the Solution of Field Integral Equations

The usual procedure forevaluating the outer reaction integral that appears in surface integral equation formulations solved via the method of moments is numerical integration using Gauss quadrature schemes. However, standard Gauss quadrature schemes often struggle with near-singular test integrals, leading to inaccuracies that degrade the current solution vector. We show that even a few inaccurate impedance matrix elements can significantly affect the overall solution.