In this article, we propose a new design of a multibeam cylindrical Luneburg lens antenna designed in the 28 GHz band. The proposed antenna is based on the parallel plate waveguide technique, in which the plates are separated by a fixed spacing and a homogenous dielectric material is applied between the plates. The most intuitive advantage of the proposed lens against the previous ones is the simplicity of the lens profile and volume, which is essential for the whole design and manufacturing processes for high-frequency applications. In addition, it provides a cost-effective and simple mechanical assembly. To reduce the losses associated with the feed elements, the lens is excited by an array of simple and compact integrated waveguide elements. The measured results show that the proposed antenna achieves a maximum gain of 17.73 dB and a maximum beam steering angle of 57.7° in the azimuth plane. Furthermore, the measured gain of the antenna varies by only 1 dB over the entire beam steering rang and the measured side lobe level of the antenna is less than −12.2 dB.

中文翻译：

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用于 28 GHz 频段点对多点通信的波束控制透镜天线

在本文中，我们提出了一种在 28 GHz 频段设计的多波束圆柱形 Luneburg 透镜天线的新设计。所提出的天线基于平行板波导技术，其中板以固定间距分开，并且在板之间施加均质电介质材料。与以前的镜头相比，所提出的镜头最直观的优势是镜头轮廓和体积的简单性，这对于高频应用的整个设计和制造过程至关重要。此外，它提供了一种经济高效且简单的机械装配。为了减少与馈电元件相关的损耗，透镜由简单紧凑的集成波导元件阵列激发。测量结果表明，所提出的天线实现了 17 的最大增益。73 dB，方位平面中的最大波束转向角为 57.7°。此外，在整个波束控制范围内测得的天线增益仅变化 1 dB，测得的天线旁瓣电平小于 -12.2 dB。