Design of a coaxial collinear array antenna with low sidelobe

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 arrays 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.