宽角扫描赋形对称单反射面天线的优化设计

Optimal design of shaped symmetric single reflector antenna for wide-angle scanning

为满足宽角扫描的要求,基于几何光学理论对一种对称单反射面天线进行了赋形设计。以扫描口径面上射线路径的方差为目标函数,采用Powell方法极小化该函数,最终确定出了反射面的方程、特定扫描角度下的馈源位置以及馈源对反射面的照射区域,实现了天线扫描工作时的最小增益损失和最高口径利用效率。分析结果表明,所设计的单反射面天线在宽角扫描范围内,方向图无大的畸变,增益损失很小,副瓣电平达到了设计要求。本文赋形方法为宽角扫描双反射面天线的赋形设计奠定了基础。

Based on the geometrical optics method, the optimal design of a kind Of symmetric single reflector antennas for realizing the wide-angle scanning is addressed. Firstly, summation of rays＇ path variances is taken as the objective function, and then Powell method is used to minimize this function. As a result, the reflector equation, feed location and the region on the reflector illuminated by the feed for the specific scanning angle is determined,respectively. Therefore, the minimum gain loss and the maximum aperture utilization efficiency during the beam scanning are realized. The analysis results show that the patterns of the shaped antenna in the wide-angle scanning region have less distortion, the gain losses are very small, and the side lobe levels meet the design specification. The shaping design technique adopted in this paper will lay the foundation for the shaped design of the dual reflector antennas under the wide-angle scanning.