Ku波段80单元长直线螺旋阵列天线设计

Design of a Ku-band 80 unit long linear helical array antenna

为了实现高功率共形阵列天线,提出并设计了一种可用于柱面组阵的Ku波段80单元长直线螺旋阵列天线。通过对探针结构的改进,并在馈电系统中采用多种形式探针,解决了长直线阵列设计中馈电系统反射大、单元耦合需求差异大的问题,实现了单元天线的近似等幅馈电。通过对封口方式的改进,确保了该直线阵对能量的充分利用。阵列天线设计结果表明:在12~13 GHz的频带范围内反射系数小于-28 dB;在中心频点12.5 GHz处增益为26.1 dB,轴比为1.72 dB,设计功率容量为166 MW,口径效率达到90%。该阵列天线具备高功率、高增益优势的同时,能够更好地适应柱面共形的需求。

To realize high power conformal antenna array,a Ku-band 80-element long linear helical array antenna was proposed and designed.By improving the probe structure and adopting various forms of probes in the feed system,the large reflection and large difference of unit coupling were solved in the design of long linear array,and the equi-amplitude feed of the element antenna was nearly realized.The full use of energy of the linear array was ensured by improving the sealing structure.The simulation shows that the reflectance of the antenna is below-28 dB from 12 GHz to 13 GHz.At the central frequency of 12.5 GHz,the gain and axis ratio are 26.1 dB and 17.2 respectively.The power-capacity is 166 MW,and the efficiency of the antenna is 90%.The array antenna retained the advantages of high power and high gain,and could meet the needs of cylindrical conformal.