Non-uniform triangulation technique in the shooting and bouncing ray method

The shooting and bouncing rays (SBR) method is widely used in computing the scattering by realistically complex geometries with electrically large features. SBR employs geometrical optics (GO) ray tubes to impress physical optics (PO) surface currents through multiple bounces, which are then radiated to compute the scattered fields. The calculated GO fields are only determined by the incident wave and the geometry of the scatter. Consequently, the mesh will have no effect on the calculated GO fields, if the mesh can represent the scatter very well. Based on this principle, non-uniform triangulation technique is introduced to accelerate the scattered field calculation in the SBR method. Numerical simulations demonstrate the performance of non-uniform triangulation technique.