HYBRIDIZATION OF SBR AND MOM FOR SCATTERING BY LARGE BODIES WITH INHOMOGENEOUS PROTRUSIONS - SUMMARY

A hybrid technique combining the shooting-and-bouncing-ray (SBR) metho d and the method-of-moments (MoM) is presented for analyzing scatterin g by large conducting bodies having small, inhomogeneous protrusions. In this technique, the MoM with an approximate Green's function is use d to characterize the small protrusions, yielding an admittance matrix , which, when multiplied with the incident field on the protrusions, y ields the currents induced on the protrusions. The incident field in t he presence of the large bodies is calculated using the SBR method. Th e field radiated by the currents on the protrusions is also calculated using the SBR method with the aid of reciprocity. Furthermore, an ite rative approach is developed, which can reduce the error introduced by the use of the approximate Green's function. Numerical results are gi ven to demonstrate the efficiency, accuracy, and capability of the hyb rid technique.