因为在太赫兹(THz)波段下对物体缩比模型雷达散射截面(RCS)的测量可以减少RCS的测量周期与成本,所以太赫兹RCS计算与测量得到了更加广泛的关注。实际测量应用中,多采用类似高斯光束的太赫兹源,然而在计算中通常假定入射光为平面波。为研究这种假设给平板RCS计算结果带来的误差,计算了高斯光束入射条件下二维导体平板的RCS。仿真研究了入射光为2.52THz激光对导体平板雷达散射截面的影响,同时与平面波入射结果进行了比较分析。计算结果显示,当导体平板宽度为20mm时,选择波束宽度为40mm的高斯光束作为入射光可以将误差的震荡控制在0.3dB左右。 The measurement and measurement of terahertz RCS have gained more attention because the measurement of the RCS of the object reduction model in the THz band can reduce the measurement period and cost of the RCS. In practical measurement applications, terahertz sources like Gaussian beams are often used. However, it is usually assumed in the calculation that incident light is a plane wave. In order to study the error caused by this assumption to the plate RCS calculation, the RCS of two-dimensional conductor slab under Gaussian beam incident condition was calculated. The influence of 2.52 THz incident laser light on the scattering cross section of the radar is simulated and compared with that of the plane wave. The calculated results show that when the width of conductor slab is 20mm, the Gaussian beam with a beam width of 40mm is selected as the incident light to control the error oscillation to about 0.3dB.