An FFT-Based Formulation for the Computation of Electromagnetic Scattering From 3-D, Perfectly Conducting Bodies

Abstract

An FFT‐based formulation for the computation of electromagnetic scattering from 3‐D, perfectly conducting objects is presented. The formulation solves the EFIE iteratively via a conjugate gradient scheme and has the major advantage of a low storage requirement for scatterers in the resonance region. This factor, coupled with the low run‐times resulting from use of the FFT to compute the associated matrices, makes the formulation a particularly efficient one. Numerical results encompassing current distributions and far‐field radar cross‐sections are presented for PEC cubes of resonant size. It is shown that the computed results yield good agreement compared with other numerical techniques and experimental data.