The Fast Physical Optics Method on Calculating the Scattered Fields From Electrically Large Scatterers

Abstract

In this article, we propose the fast physical optics (FPO) method to calculate the scattered fields from the electrically large scatterers. The quadratic patches are adopted to discretize the surfaces of the scatterers. Invoking the quadratic amplitude and phase functions approximations, the closed-form formulas could be obtained with the complementary error function. Hence, the FPO method is time-saving compared with the conventional methods. Moreover, the accuracy and the physical insight of the closed-form formulas are expounded. Numerical examples demonstrate the efficiency of the FPO method with respect to both the accuracy and CPU time.