采用换元物理光学法分析桁架式可展开反射面天线方向图

采用换元物理光学法分析桁架式可展开反射面天线方向图

内容简介：桁架式可展开反射面天线在未来的星载合成孔径雷达(SAR)中将有着广泛应用,然而目前对该类天线方向图的系统性理论分析还不够完善.该文根据桁架式天线反射面的特殊构型——空间三角形单元拓扑结构,提出了一种将物理光学法与换元法相结合来计算馈源数目任意、位置任意的桁架式天线方向图的方法,仅需反射面上的节点坐标即可求出天线方向图.对矩形喇叭线阵馈源激励下的口径大小为2.8 m×6 m 的桁架式可展开反射面天线方向图进行编程仿真,得到的主要参数计算值与实测值相吻合,通过与几何光学法仿真结果相比较,得出该文提出的算法更为精确有效.该文提出的算法建立了桁架式天线反射面结构与天线方向图的直接联系,实现了该类天线的机电一体化设计.

Abstract：Deployable truss reflector antenna will be applied broadly to Synthetic Aperture Radar (SAR) on satellite in the future, while the systematically theoretical analysis of the truss reflector antenna’s pattern is still not fully developed now. Based on the special reflector shape of deployable truss reflector antenna which is composed of a number of space triangle elements, a method that combines Physical Optics (PO) method and substitution is proposed to calculate the pattern of truss antenna illuminated by arbitrary numbers and locations of feeds in this paper. To solve the pattern, only coordinates of vertexes on the reflector are used. The method is applied to simulate the pattern of a 2.8 m×6 m-aperture deployable truss reflector antenna which is illuminated by rectangular horns line array, and the simulation results of the main pattern parameters coincide with the practical measured values and show a better performance than geometrical optics method’s simulation results. The method shows direct ties between the construction of truss antenna’s reflector and its pattern, and it realizes the electromechanical integration design of deployable truss reflector antenna.

作者：王乐*, 高文军, 雷宏, 刘肖萌, 熊永虎,

关键词：桁架式可展开反射面天线, 方向图分析, 换元物理光学法, 机电一体化设计,