Application of FD-MEI to electromagnetic scattering from transversally anisotropic inhomogeneous cylinders

The numerical solution of the finite difference with the measured equation of invariance (FD-MEI) for transversally anisotropic cylinders is presented. It is different from the currently available methods for the anisotropic scatterers; this approach involves both the finite-difference equations at interior nodes of the mesh and the measured equation of invariance for the boundary nodes of the mesh. It has the merit of saving the computing time and computer memory needs. By introducing the novel nine-point mesh the generalized finite-difference equations for the inhomogeneous transversally anisotropic material are derived. The radar cross section (RCS) for inhomogeneous, lossy, electrically large, and arbitrarily shaped two-dimensional transversally anisotropic objects are calculated. The computing efficiency and accuracy are assessed using comparisons with two other methods, namely, the integral equation based on a plane wave representation of the fields and the combined field surface integral equations when available.