Accelerating solution of rough surface scattering problems by using the UV technique in conjunction with the Characteristic Basis Function Method and the Adaptive Cross Approximation

In this paper the UV technique (L. Tsang, D. Chen and P. Xu, Radio Sci., Vol.36, RS5010, 2004) is introduced to accelerate the Combined Characteristic Basis Function Method (CBFM) and the Adaptive Cross Approximation (ACA) method for the problem of scattering from rough surfaces. The application of Method of Moments (MoM), based on RWG basis and Galerkin approach, to the electric field integral equation (EFIE) leads to a dense linear system. The mutual-impedance elements can be obtained by calculating the following four scalar integrals (H. T. Chen, J. X. Luo and G. Q. Zhu, Microw.Opt.Techno.Lett., Vol.48, 1615-1618, 2006) equation