椭圆柱体对任意入射极化的电磁波的散射

基于电磁场的多尺度变换理论,得到了以导体椭圆柱为例的电磁波任意极化,任意垂直入射到目标上的散射场的解析式.将所得结果应用于计算圆柱目标的散射场,结果与文献完全一致.对椭圆柱体的散射宽度随入射波方位角,电磁波频率以及目标尺寸的变化进行了仿真.结果表明,在垂直于电磁波的方向上观测时,椭圆柱的垂直尺寸对散射有较大的影响,电磁波水平极化时散射最强.所用算法适用于介质椭圆柱等目标的散射特性研究,所得结果为目标尺寸、形状遥感电磁测量等实际应用提供了理论依据.

Scattering From an Elliptic Cylinder Irradiated By an Electromagnetic Wave With Arbitrary Direction and Polarization

Based the threedimensional scales transformation of E. M. theory, the analytical expression of scattering field from a conductor elliptic cylinder is presented, as the electromagnetic wave propagating vertical to the axis of an elliptic cylinder with arbitrary incident angle and polarization. The obtained result is in agreement with that in the reference when we use the analytical expression to calculate the scattering field from a cylinder. The varying of scattering width of this elliptic cylinder with the incident azimuth angle, frequency and sizes of the target is simulated. It is shown that the vertical size of the elliptic cylinder effects greatly the scattering field when we observe it in the direction perpendicular to the direction of incident wave. The scattering field is strong as the polarization direction of incident wave parallels to the axis of the elliptic cylinder. The algorithm used in the article can be able used to investigate the scattering characteristic of other elliptic cylinders. The obtained result offers a theoretical foundation for the practical applications such as electromagnetic remote sensing of target's size and shape.