Numerical results in 2D case show that the specular reflection is not obvious in the near-field scattering ,but it is obvious and is the dominat reflection in the far-field scattering.

• 数值结果表明在三角柱体的电磁散射近场中镜面反射并不明显，但在远场却非常明显并且成为最主要的散射方向。