A hybrid SBR/FE-BI technique for computing the RCS of electrically large objects with deep cavities

The radar cross section (RCS) computation of electrically large objects is still a major challenge in the field of computational electromagnetics (CEM). In the industrial world, the shooting and bouncing ray (SBR) technique remains the method of choice to solve high-frequency problems. However, it is well known that the SBR encounters major difficulties with cavity scattering. Recently, a special higher order finite element-boundary integral (FE-BI) approach has been developed that allows us to compute the RCS of deep cavities at a very low cost compared to the usual low-frequency techniques. Therefore, it is possible to hybridize this new technique with an SBR code to obtain an affordable high-frequency code that overcomes the cavity problem. This paper briefly describes the hybrid method and shows some numerical results.