对流层风廓线雷达对阵列天线的要求是结构简单, 在满足高增益条件下, 低副瓣是其关键指标。针对该应用背景, 提出了一种辐射单元长度可变的同轴共线天线 (COCO)模型。该天线模型利用不同数量辐射节COCO线源组阵, 其口径幅度为修正Taylor分布。在该模型基础上, 采用数值计算和优化, COCO阵列天线增益为25.7 dB, E面副瓣为-23 dB, H面副瓣为-22.3 dB。该天线阵样品的测试表明, 所设计的低副瓣COCO阵列天线完全达到了设计目标。

A coaxial collinear (COCO) array antenna is one of the key components in wind profile radars, which requires simple structure, low sidelobe and high gain. This paper presents a novel COCO array antenna with an adjustable radiation sectors. By employing these adjustable sectors, the modified Taylor distribution of the array’s surface amplitude can be achieved. Using numerical analysis, the proposed COCO array antenna is optimized, the sidelobe level at working frequency on E and H planes are -23 dB and -22.3 dB, respectively, and the gain reaches 25.7 dB. Furthermore, the experiments show that the COCO array antenna can meet all of the design goals.