Demetriadou Angela, Hao Yang
Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK.
Opt Express. 2011 Oct 10;19(21):19925-34. doi: 10.1364/OE.19.019925.
Luneburg lens is a marvellous optical lens but is extremely difficult to be applied in any practical antenna system due to its large spherical shape. In this paper, we propose a transformation that reduces the profile of the original Luneburg lens without affecting its unique properties. The new transformed slim lens is then discretized and simplified for a practical antenna application, where its properties were examined numerically. It is found that the transformed lens can be used to replace conventional antenna systems (i.e. Fabry-Perot resonant antennas) producing a high-directivity beam with low side-lobes. In addition, it provides excellent steering capabilities for wide angles, maintaining the directivity and side-lobes at high and low values respectively.
伦伯格透镜是一种出色的光学透镜，但由于其巨大的球形形状，极难应用于任何实际的天线系统。在本文中，我们提出了一种变换方法，该方法在不影响其独特特性的情况下减小了原始伦伯格透镜的轮廓。然后，对新变换后的超薄透镜进行离散化和简化，以用于实际的天线应用，并通过数值方法研究其特性。结果发现，变换后的透镜可用于替代传统天线系统（即法布里-珀罗谐振天线），产生具有低旁瓣的高指向性波束。此外，它在宽角度范围内提供了出色的波束控制能力，分别在高角度和低角度下保持指向性和旁瓣水平。
