根据雷达方程中雷达散射截面参数的物理意义，提出了可以将目标雷达散射截面看成为反射面天线的分析模型，用该模型估算了任意形状平板导体目标后向雷达散射截面，分析了亚毫米波频段使用雷达散射截面参数的适用条件，提出了亚毫米波频段雷达方程中应用雷达散射截面参数的限制条件，给出了平板导体在目标近场条件下，目标实际的雷达散射截面的变化规律，以及与对应情况下平面波照射时的雷达散射截面的关系。

Based on the physical explanation of radar cross section(RCS) in a radar equation,a model is proposed to analysis the RCS of objects,in which the object are considered as a reflection antenna.The RCS of a thin plate perfect electric conductor in any shape is calculated roughly by using the model.The restriction condition of RCS of objects in high frequency is given.Finally,the relation between RCS and frequency is checked when the object is in near field region.

TN951