Abstract: Scattering characteristics of objects can be retrieved by characteristic basis function method(CBFM),then,new series of basis functions are built based on the eigenvectors,which can be applied to reduce the unknowns needed for MoM method.The method is appropriate for the analysis of finite periodic array problems.While,to consider electric ultra-large problems,it is still an incredible requirement of memory and CPU time to solve the matrix equations based on characteristic basis functions(CBFs),which is dif...