L波段径向线螺旋阵列天线的优化设计
Optimization of L-band helical array antenna fed from radial waveguide
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摘要: 以提高阵列天线的口径效率为目标，对辐射单元及阵列布局进行了优化，设计了中心频率为1.57 GHz的6元单圆环径向线螺旋阵列天线，采用时域有限积分算法软件对阵列天线进行了数值模拟，结果表明：口径为320 mm的该天线在中心频率上可获得14.4 dBi的增益，口径效率达99%，轴向轴比值为1.15，在1.5～1.7 GHz的频带范围内，增益大于13.9 dBi，口径效率大于97%，轴向轴比值小于1.35。Abstract: This paper describes a new antenna for realizing the directional radiation of helical array antenna fed from radial waveguide. The configuration parameters of the element and the layout of array antenna are optimized with the purpose of enhancing the aperture efficiency of the antenna. A circular array antenna composed of 6 elements with a frequency band of 1.5 GHz to 1.7 GHz is designed and simulated. The numerical simulation shows that at 1.57 GHz, the aperture efficiency reaches 99%, and the axial ratio at the normal direction is 1.15. In the range of 1.5 GHz to 1.7 GHz, the aperture efficiency is greater than 97%, the axial ratio is less than 1.35.
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