Solving scattering from conducting multi-object by hybrid MLFMA with generalized forward-backward method

To speed up the solution of scattering from conducting multi-object with complex structures, a hybrid multilevel fast multipole algorithm (MLFMA) with generalized forward-backward method is developed in this paper. The region enclosing conducting multi-object is divided into finite uniform sub-regions. The induced current in each sub-region is solved iteratively by generalized forward and backward (GFB) method. The interactions between sub-regions and the iterative current in each sub-region are computed by the MLFMA. The present method has the memory requirement of O(N_maxlogN_max), where N_max is the maximum number of unknowns located in these sub-regions. Numerical results demonstrate the efficiency and accuracy of the present method for scattering from conducting multi-object.