A highly efficient numerical solution for dielectric-coated PEC targets

In this paper, the multi-layer TDS (thin dielectric sheet) integral equation approach is first proposed. This method divides the geometric model into multiple thin layers and assumes the flux density to be constant with respect to the normal direction within each layer. Consequently, the number of unknowns is significantly reduced while the precision of the results could be maintained. Then, the multi-layer TDS integral approach is combined with the PEC (perfect electric conductor) boundary conditions together to handle scattering from dielectric coated PEC objects. This new procedure simplifies the coupled surface (for the conductor)-volume (for dielectric) integral to a surface-surface integral with much fewer unknowns. Furthermore, a remedy approach is also presented in this paper to improve the deteriorated precision for open composed structures due to the significant singular currents near the boundary edges. Compared with traditional PEC-TDS methods, the method presented in this paper can deal with scattering from thick or stratified coatings with arbitrarily lateral or normal inhomogeneity. Its improvement is also capable of handling dielectric coatings on open PEC surfaces. The numerical results at the end show good agreement with the references, showing the accuracy and the validity of these solutions.