A novel cylindrical Luneburg lens operating at 26 GHz-band using hole drilling technology are reported, aiming at proper radiation patterns. The cylindrical Luneburg lens antenna converge microwaves in the plane perpendicular to the generatrix of the cylinder. An E-plane-focused cylindrical Luneburg lens antenna with the thickness of 20 mm and diameter of 88.2 mm is proposed for working at 26 GHz. Feed of the lens antenna is a conventional rectangular waveguide. Furthermore, in order to compensate the phase of the microwave in the nonconverging plane (H-plane in this case), a pair of printed circuit boards (PCBs) etched with particular metal grids is attached to the side faces of the lens. With optimized design for the grids, a narrower beam is obtained in the H-plane while the sidelobe level (SLL) of the cylindrical Luneburg lens could be drastically reduced compared with lens antenna without the special metal grids. Measured results of the fabricated lens antennas are in a good agreement with the simulation, proving its effectiveness and practicability that the designed grids benefit the radiation pattern performances. With an appropriate pattern for the H-plane achieved, proposed cylindrical Luneburg lens operating at millimeter-wave (mmW) band is a suitable candidate for multibeam communication systems.

中文翻译：

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一种新型 E 平面聚焦柱面 Luneburg 透镜，装有金属网格，可降低旁瓣电平

报道了一种使用钻孔技术在 26 GHz 频段工作的新型圆柱形 Luneburg 透镜，旨在获得适当的辐射模式。圆柱形 Luneburg 透镜天线在垂直于圆柱母线的平面内会聚微波。提出了一种厚度为 20 毫米、直径为 88.2 毫米的 E 平面聚焦圆柱形 Luneburg 透镜天线，用于在 26 GHz 下工作。透镜天线的馈源是传统的矩形波导。此外，为了补偿非会聚平面（在这种情况下为 H 平面）中的微波相位，一对用特定金属网格蚀刻的印刷电路板 (PCB) 连接到透镜的侧面。通过对网格的优化设计，与没有特殊金属网格的透镜天线相比，在 H 平面中获得了更窄的波束，而柱面 Luneburg 透镜的旁瓣电平 (SLL) 可以大大降低。所制作的透镜天线的实测结果与仿真结果吻合较好，证明了所设计的网格有利于辐射方向图性能的有效性和实用性。通过实现 H 平面的适当模式，建议的在毫米波 (mmW) 波段工作的柱面 Luneburg 透镜是多波束通信系统的合适候选者。证明其设计的网格有利于辐射方向图性能的有效性和实用性。通过实现 H 平面的适当模式，建议的在毫米波 (mmW) 波段工作的柱面 Luneburg 透镜是多波束通信系统的合适候选者。证明其设计的网格有利于辐射方向图性能的有效性和实用性。通过实现 H 平面的适当模式，建议的在毫米波 (mmW) 波段工作的柱面 Luneburg 透镜是多波束通信系统的合适候选者。