Scattering of Multiple Objects Based on Adaptive Multilevel Complex Source Beam Method

A novel method for electromagnetic scattering of multiple objects is proposed in this work. The domain decomposition approach is firstly applied for spatial partition, and each object is divided as a separate sub-region. Then in each sub-region, the multilevel complex source beam method (MLCSB) based on the method of moment (MoM) is applied to accelerate the multiplication of impendence matrix and surface current vector. The complex source beam (CSB) expansions of the surface current for the sub-region can be obtained along with the multiplication. Finally, to fully exploiting the directional property of CSBs, an adaptive translation process based on CSBs is proposed for the coupling between sub-regions with different size. Several numerical results are given to validate the proposed method for multiple objects.