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本文用FDTD方法在散射目标近区对口径面天线与目标的相互影响进行了分析研究,在圆柱坐标系下以轴对称数值模型为例,用FDTD方法得出了散射目标电尺寸、目标与口径面天线的距离大小对天线口径面的场分布之影响的数值结果;同时获得了散射目标表面物理光学近似计算散射电流的应用范围.用圆波导中模式理论验证了方法的有效性
In this paper, the FDTD method is used to analyze the interaction between the aperture target and the target in the vicinity of the scattering target. Taking the axisymmetric numerical model as an example, the FDTD method is used to determine the target size, target and aperture The distance between the antenna and the surface of the antenna is calculated and the numerical results of the field distribution of the antenna aperture surface are also obtained.At the same time the range of application of the scattering current calculated by the physical optics of the scattering target surface is obtained.The validity of the method is verified by the mode theory of the circular waveguide