双圈圆阵方向特性分析

研究了双圈圆阵在两种不同放置情况下的方向特性, 主要包括阵列方向图的指向、主瓣波束宽度和副瓣峰值电平等.首先, 建立了双圈圆阵的阵列模型, 推导方向图公式并推广到多圈圆阵的情况, 随后对其进行了理论分析.其次, 通过大量仿真实验, 分析了主瓣的半功率点波束宽度和副瓣峰值电平以及扫描角分别与内、外圈阵元数以及内、外圈阵元半径之间的关系.最后, 对理论分析和仿真结果进行综合梳理, 发现在阵元内、外半径之比为0.5左右时副瓣电平最低, 波束宽度会随着内圈阵元数增大而增大, 随外圈阵元数增大而减小等结论.实验结果可为实际工程应用中合理设置阵元数目以及阵元位置提供理论参考.

Direction characteristics for dual circular array

In this paper, the directional characteristics of two different placed dual circular arrays are studied, including the direction of radiation pattern, the beam width of the main lobe and the sidelobe level. Firstly, the array model of the dual circular array is established, the formula of the radiation pattern is deduced and extended to multi-circle circular array, and theoretical analysis is carried out. Secondly, a large number of simulation experiments are carried out by MATLAB software to analyze the relationship among the half-power beamwidth of the main lobe, the sidelobe peak level, the scanning angle and the number of array elements, as well as the relationship between the radius of the inner and outer elements. Finally, the theoretical analysis and simulation results are comprehensively sorted out. The conclusions are that the lowest level of the sidelobe exists when the radius ratio of inner and outer array is about 0. 5, and the beamwidth increases with the number of inner circular array elements but decreases with the number of outer circular array elements. The experimental results can provide theoretical reference for the reasonable setting of the number of elements and the location of the array elements.