The influence of mesh fineness on virtual divergence factor for high frequency methods in electromagnetic scattering

Due to simplicity, high frequency hybrid methods based on ray tracing have been widely used for the fast simulations of electromagnetic scattering. For curved concave targets, the usage of faceted models might greatly degrade the accuracy of evaluation owing to the loss of divergence factor (DF). Recently, a new and efficient factor, entitled virtual divergence factor (VDF), has been proposed to play the role of DF. Although its validity and efficiency have been demonstrated convincingly, the influence of mesh fineness on VDF is still in need of study. In this paper, two composite targets of strong multiple ability, including a simplified model of “Ship on the Sea,” are analyzed. Based on the detailed comparisons of simulated results with different mesh sizes for the same target, it is found that in general the influence of mesh fineness is relatively small. This is highly desirable, and will make those ray tracing hybrid methods with VDF correction much more flexible and attractive.