Electromagnetic scattering modeling of anisotropic coating target based on point source excitation

In this paper, PO solution of electromagnetic scattering of anisotropic coating target under point source excitation has been derived. Firstly, According to the tangent plane approximation in the PO field, the high frequency scattering problems of point source excitation infinite plane model coated anisotropic medium can be solved specifically. Secondly, we can expand any scattering wave field including point source into plane wave and then obtain the rigorous solution of the problem in the spectral domain by using boundary conditions of coating layers at the top and bottom. What's more, every spectral integral has been computed using asymptotic saddle point approximation method, and which has property of ray field. Finally, we can deduce the expression of equivalent electromagnetic flow based on the point source excitation of surface element coated anisotropic materials. Then we build the most complete PO calculation method of scattering target coated anisotropic materials based on point source. Additionally, Using the physical meaning of saddle point in this problem, we can also get the direct wave field solution of point source primary reflection wave field of the initial excitation in anisotropic medium surface reflection layer and each secondary wave field solution of scattering model which experience different times of reflection in the medium layer. The mathematical calculation and physical analysis of scattering process realize perfect combination.