Bespoke Lenses Based on Quasi-Conformal Transformation Optics Technique
Bespoke Lenses Based on Quasi-Conformal Transformation Optics Technique
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DOI：
10.1109/tap.2017.2679494
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发表时间：
2017-05-01
影响因子：
5.7
通讯作者：
Quevedo-Teruel, Oscar
中科院分区：
文献类型：
--
作者：
Ebrahimpouri, Mahsa;Quevedo-Teruel, Oscar
本文提出了一种基于准共形变换光学技术的系统方法，用于设计给定激励下的准最佳透镜轮廓。这种方法适用于一些传统的天线，如孔径和对数螺旋槽。在所有这些配置中，观察到方向性的增加。利用该方法设计了一种宽带增强漏缝激发的准最佳梯度折射率透镜，并与有匹配层和无匹配层的超半球透镜进行了比较。我们提出的方法表明，能够增加的方向性，以减少旁瓣和交叉极化在一个宽的带宽从20到70 GHz。由于透镜轮廓的连续变化的介电常数，在透镜内部的反射也显著减少。
In this paper, a systematic method to design a quasioptimum lens profile based on quasi-conformal transformation optics technique for a given excitation is presented. This method is applied to a number of conventional antennas, such as an aperture and a log-spiral slot. In all these configurations, an increase of the directivity is observed. Furthermore, using this method, a quasi-optimum graded index lens for a broadband enhanced leaky slot excitation is designed and the results are compared with a hyperhemispherical lens with and without matching layers. Our proposed methodology demonstrates to be able to increase the directivity, to reduce the sidelobes and the cross polarization in a broad bandwidth from 20 to 70 GHz. Due to the continuously changed dielectric constant of the lens profile, reflections are also reduced considerably inside the lens.