Abstract
In the terahertz (THz) region, the precision and the realism of the CAD models have great influence on EM scattering characteristics. Low-frequency methods are typically limited to problems of small electrical size due to limitations of computation time and system memory. The ray-based high-frequency EM method, shooting and bouncing rays (SBR), are employed to solve THz target scattering. A very common way of representing arbitrary targets is via a surface mesh made of triangular facets. To guarantee the geometrical accuracy, a small size of the mesh elements must be chosen. Ray tracing becomes more time-consuming while in THz band. A special ray-tracing technique that combined geometric optics (GO) with non-uniform rational B-Splines (NURBS) has been implemented. Numerical examples demonstrate the accuracy and efficiency of the approach.
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