Abstract: A new highly efficient domain decomposition method based on the partial basic solution vectors (PBSV-DDM) is presented for solving arbitrary electrically large 2D electromagnetic scattering problems. Different from the traditional domain decomposition method (DDM) by which one needs to solve matrix equations in each sub-domain during every iteration till convergence, which is considerably inefficient and time-consuming, the matrix equations in the new PBSV-DDM algorithm could be solved for a set of standard orthogonal excitation vectors to get the partial basic solutions.Then the solution in each sub-domain is obtained only by a simple vector summation operation in every iteration procedure.Obviously, the computational efficiency would be greatly improved.The validity and computational efficiency of PBSV-DDM have been verified by numerical examples.

Key words: domain decomposition method, PBSV-DDM, electromagnetic scattering, FDFD