MLFMA, PO and hybrid MLFMA-PO for impedance boundary condition

Abstract

Multilevel fast multipole algorithm (MLFMA), physical optics (PO), and their combination, hybrid MLFMA-PO, are developed for the radar cross section computation of electrically large imperfectly conducting objects modelled with the impedance boundary condition. Surface integral equation formulation of the problem is based on the self-dual integral equation formulation by Yan and Jin. Numerical properties of the methods are investigated for various surface impedances.