High-precision calculation of electromagnetic scattering by the Burton-Miller type regularized method of moments

Abstract High-precision calculation of electromagnetic scattering plays an important role in industrial field. This study aims to apply the latest research results based on semi-analytical boundary collocation method to calculate computational electromagnetics. The article focuses on discussing some common mechanical bottlenecks encountered by semi-analytical boundary collocation method in simulating electromagnetic scattering, such as the non-uniqueness at internal resonance, the singularity and near singularity of the fundamental solution and the preconditioning problem. The article constructs a regularized method of moments based on the Burton-Miller formulation to avoid the non-uniqueness at internal resonance. The origin intensity factor and nearly singular factor are used to replace the singular and nearly singular terms of the interpolation matrix. A novel fast near-field approximation preconditioner is introduced to greatly reduce the number of iterations without significantly increasing storage and computational complexity. Numerical experiment shows that the Burton-Miller type regularized method of moments can accurately calculate radar cross section scattered by the NASA almond model and real human head.