Switched beam antennas provide an efficient and cost effective alternative to complex phased array and digital beam forming techniques. In this paper, we present the design and characterization of an electrically thin Huygens metasurface lens operating at 83GHz with high transmission efficiency and we demonstrate its applicability to switched beam antenna applications. We accurately characterize the 3D scattered field distribution and determine the focal length and transmission efficiency of the lens by near-field scanning. A model based on ideal Huygens sources is used to predict the focal performance, allowing the geometrical measurement parameters to be determined in advance. Finally, the ability of the lens to operate as a switched beam antenna is experimentally verified by exciting it with an omnidirectional waveguide antenna placed at different positions. The experimental results are in very good agreement with numerical simulations, showing steering angles up to 12° while keeping the side lobe level below −15dB.

中文翻译：

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惠更斯超表面透镜，用于W波段开关波束天线应用

开关波束天线为复杂的相控阵和数字波束形成技术提供了一种有效且具有成本效益的替代方案。在本文中，我们介绍了工作在83GHz且具有高传输效率的电薄惠更斯超表面透镜的设计和特性，并证明了其在开关波束天线应用中的适用性。我们准确地表征3D散射场分布，并通过近场扫描确定镜头的焦距和传输效率。基于理想惠更斯光源的模型可用于预测焦点性能，从而可以预先确定几何测量参数。最后，通过放置在不同位置的全向波导天线激发透镜，可以通过实验验证透镜用作开关波束天线的能力。实验结果与数值模拟非常吻合，显示了高达12°的转向角，同时旁瓣电平保持在-15dB以下。