W波段电大尺寸椭圆柱形反射面天线的设计

Design of a W-Band Elliptic Cylindrical Reflector with Electronically Large Size

研制了一种W波段电大尺寸椭圆柱形反射面天线,利用椭圆双焦点的几何特性,通过合理设计口径面利用率及天线效率,使得天线在近场具有较窄的焦斑宽度,同时在远场也能具有较高的方向性,适用于中、远距离均要求有较高横向距离分辨率的目标探测雷达。针对电大尺寸反射面天线仿真工作量大的问题,提出一种简化设计方法,提高了天线的设计效率。利用紧缩场（CR）测试方法对天线进行远场辐射方向图测量,通过雷达系统的目标探测实验测试了天线的近场焦斑宽度。实测数据与仿真结果之间的良好一致性证明了整个天线设计方法的可靠性和准确性。

In this paper,a W-band elliptic cylindrical reflector with electronically large size is developed. Due to the geometric characteristics of double focus of the ellipse,the antenna has a narrow focal spot width in the near field,while in the far field can also has a high directivity by reasonably designing the aperture surface utilization and antenna efficiency. It is suitable for the target detection radar that requires high cross range resolution in both midrange and long range. In order to reduce the workload of simulation optimization,a simplified design method is proposed to improve the efficiency of design. Finally,the far-field radiation pattern of antenna has been tested by a Compact Range（ CR） measurement system,and the focal spot width of antenna has been measured by the object detection experiment. The measured data are in good agreement with the simulation results,thus proving the reliability and accuracy of the design process.