A Novel DDM Based on Full Basis Functions Division for Solving Electromagnetic Scattering

A novel domain decomposition method based on Full Basis Function division (FBF-DDM) is proposed to analyze scattering problems from electrically large and complex perfect electric conductor (PEC) targets. Specially, the original model surface is divided into several open subdomains according to the distribution of basis functions, and it is not necessary to add artificial surface or buffer region between adjacent subdomains. Meanwhile, the single-layer toothed triangular mesh cells located on one side of the boundary line between adjacent subdomains is shared by these two adjacent subdomains to ensure the integrity of basis functions. For the purpose of improving the simulation accuracy, each subdomain is solved independently by using LU decomposition. Furthermore, the coupling between different subdomains is calculated in the manner of near field to avoid the storage of mutual impedance matrix, and thus, the memory requirement is reduced greatly. Numerical results demonstrate the validity and the stability of the proposed method.