单元方向图对阵列综合性能影响分析

在阵列天线综合问题中,传统方法假设各辐射单元各向同性且忽略互耦效应。工程应用中这些忽略会给计算结果带来较大的误差。本文首先建立了天线单元方向图对天线阵列性能影响的数学模型,对阵列指向精度、目标方向图赋形等问题进行了仿真对比分析。为了克服由单元方向图带来的误差,将阵中单元方向图代入优化过程中,算例表明该措施的有效性。考虑了阵列边缘单元辐射特性差异对阵列性能的影响。仿真结果表明在优化过程中考虑这些差异可以进一步提高计算精度。

Effect of cell pattern on integrated performances of arrays

When it comes to the antenna array integration, the conventional methods always assume the cell radiation pattern is isotropic and ignore the couple effect, which can lead to large errors in engineering applications. A math model of the effect of the antenna cell pattern on the performances of antenna arrays is established, and the pointing accuracy of arrays and the pattern shape are simulated, compared and analyzed. In order to minimize the errors caused by the cell pattern, the cell pattern is considered when the desired pattern is formed, and the example indicates that this method is effective. The effect of different radiation characteristics of antenna cells in array edges is also considered, and simulation results show that calculation precision can be further improved when these differences are taken into consideration.