In this paper, a universal radar cross section (RCS) reduction design method for the object with anisotropic impedance surface is proposed. It is effective to reduce RCS of the target with anisotropic impedance surface, because the anisotropic material can not only absorb the incident radar wave, but also redistribute the scattering energy in the whole space, by controlling the principal axis of the anisotropic material. The whole procedure of the proposed method is composed of three parts: universal geometry modelling, high-frequency method and standard genetic algorithm. First, the universal geometry modelling based on triangular meshing can exactly describe the geometry features of the object. Then the high-frequency method Physical optics (PO) is adopted as the forward algorithm to calculate the RCS of the target in desired angle range. Finally, in the standard genetic algorithm, the surface impedances of the target and the direction of the principal axis are considered as the optimized parameters. A reduction example of a square plate which is first illustrated in the paper demonstrates that the method is effective for the RCS reduction. In the following, the study focuses on how to reduce the RCS of a figure-complicated target in desired angle range and the DF31 missile's is taken as the example. As a comparison, the optimization of RCS for the isotropic impedance object is also presented at the same time. The simulation results demonstrate that the RCS of the object with the anisotropic impedance surface can be reduced evidently. It is found that the RCS reduction of the target coated by anisotropic material is better than the object with isotropic material coating in our research.
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