Abstract: A fast solution of 3-D metallic and dielectric objects is implemented using the precorrected-FFT method. To reduce near-zone interactions to be computed directly and precorrected, an improved stencil topology is presented in which the projection and interpolation stencils are floating but not fixed. Numerical results show that the P-FFT method based on the floating stencil can significantly reduce near-zone interactions, thus reducing memory and CPU time.

Key words: the precorrected-FFT method (P-FFT), the method of moment (MoM), EM scatering