With the ability to increase the gain of the millimeter-wave antenna system effectively, lenses have attracted wide attention. Researchers proposed a large number of lens-based array systems. When each array element works alone, the system can transmit beams in different directions. However, it is difficult to adjust the scanning angle flexibly. In this letter, we propose a method to synthesize the radiation pattern of the lens-array system, which can flexibly adjust the scanning angle by weighted array elements. First, we derive an approximate mathematical model of the lens-array system. Then, the influence of the weighting coefficients on the far-field radiation pattern of the system is analyzed. By setting coefficients as the optimization parameters and combining it with the desired beampattern, we establish an optimization model. Then we optimize the coefficients. Full-wave simulation results performed by CST studio and measured results demonstrate that the proposed method can approach the desired radiation pattern by the optimized coefficients. What's more, measured results show that the proposed method is suitable for wideband signals. Hence, the presented method can flexibly adjust the scanning angle.

中文翻译：

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阵列馈电透镜天线系统的扫描角调整方法

随着有效地增加毫米波天线系统增益的能力，透镜引起了广泛的关注。研究人员提出了大量基于透镜的阵列系统。当每个阵列元件单独工作时，系统可以沿不同方向发射光束。但是，难以灵活地调整扫描角度。在这封信中，我们提出了一种合成透镜阵列系统辐射方向图的方法，该方法可以通过加权阵列元素灵活地调整扫描角度。首先，我们得出透镜阵列系统的近似数学模型。然后，分析了加权系数对系统远场辐射方向图的影响。通过将系数设置为优化参数并将其与所需的波束图组合，我们建立了优化模型。然后我们优化系数。由CST工作室进行的全波仿真结果和实测结果表明，所提出的方法可以通过优化的系数逼近所需的辐射方向图。而且，测量结果表明，该方法适用于宽带信号。因此，提出的方法可以灵活地调整扫描角度。