A Second-Order Triangular Element-Based Domain Decomposition Method for Solving Electromagnetic Scattering Problems Using the Surface Integral Equation

In this communication, a domain decomposition method for electromagnetic scatterers is proposed. After dividing the geometry into several domains, the subdomains are divided into near, far and a buffer domain based on their relative positions. Distinct processing methods are applied to each domain and an approximate sparse and locally low-rank impedance matrix is created. The Krylov subspace is formulated using this matrix to solve for the approximate current. Compared with the traditional method of moments, this approach demonstrates faster convergence and sufficient accuracy, making it suitable for electrically large scattering problems. The accuracy and effectiveness of the proposed method are verified through numerical examples.