The Efficient Multilevel Fast Physical Optics Method for Calculating the Scattered Field

For the electrically large coated scatterers, the multilevel fast physical optics (MLFPO) is proposed to accelerate the computation of the physical optical scattered fields. This method is based on the quadratic patch subdivision and multilevel technology. The surface is discretized by quadratic patches and the amplitude and function of physical optical integration are approximated by Lagrange interpolation polynomials. Finally, numerical example shows the effectiveness of the MLFPO method in accuracy and efficiency, which make a comparison between our method and the Gordon method.