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A highly efficient hybrid method combining physical optics (PO) with physical optics is adopted to analyze the electromagnetic (EM) scattering from a perfectly electric conducting object situated above the conducting rough surface. The PO method is applied to solve the scattering of an object and the underlying rough surface, respectively. And the Huygens equivalence principle and multipath scattering strategy are employed to deal with the mutual interactions between object and rough surface. To validate the efficiency of our present method, the EM scattering of the composite model by the hybrid PO-PO method for different polarizations is calculated and compared with those using the conventional method of moments as well as computational time and memory requirements. The distribution of induced surface currents on the object and rough surface are illustrated for different scattering paths. Finally, the influence of some parameters on the composite scattering is investigated and discussed in detail.

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This study proposes and validates a new physical optics-physical optics (PO-PO) method based on the reciprocity theorem to calculate the electromagnetic backscattering from a two-dimensional (2D) dielectric-coated conducting target located above a 1D dielectric randomly rough surface. To avoid the artificial reflection from two endpoints of rough surface, the tapered plane wave proposed by Thorsos in 1988 is introduced as the incident wave. The results obtained from the author's method, for horizontal polarisation, show a good agreement with the numerical results derived from the conventional method of moments in a special case of a perfectly electric conducting target located above a dielectric rough surface. Finally, the influence of some parameters related to the coating material on the composite scattering is investigated and discussed in detail.

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