An antenna array is developed to radiate angularly distributed multibeams. The proposed antenna utilizes a 2-D Luneburg lens as a beamforming network (LL-BFN) to produce rotationally symmetric excitations. The concept is to replace an equivalent circular aperture of Luneburg lens by a circular array of excitation output ports. Thus, in addition to the beam selection ports, antenna excitation ports are also established on the LL-BFN to extract the required phases to feed an external circular array of antennas. As a result, more flexible radiation characteristics can be achieved by the circular array. This concept is demonstrated by both simulation and measurement results of an antenna prototype to validate the feasibility.

中文翻译：

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由集成二维 Luneburg 透镜波束形成网络激发的 Vivaldi 天线圆形周期阵列的多波束辐射

开发了天线阵列以辐射成角度分布的多波束。所提出的天线利用二维 Luneburg 透镜作为波束成形网络 (LL-BFN) 来产生旋转对称激励。该概念是用激励输出端口的圆形阵列代替 Luneburg 透镜的等效圆形孔径。因此，除了波束选择端口之外，还在 LL-BFN 上建立了天线激励端口，以提取所需的相位来馈送外部圆形天线阵列。因此，圆形阵列可以实现更灵活的辐射特性。这个概念通过天线原型的仿真和测量结果来证明，以验证可行性。