Maxwell Fisheye Lens Based Retrodirective Array
Maxwell Fisheye Lens Based Retrodirective Array
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DOI：
10.1038/s41598-019-52779-1
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发表时间：
2019-11-07
影响因子：
4.6
通讯作者：
Fusco, Vincent F.
中科院分区：
文献类型：
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作者：
Abbasi, Muhammad Ali Babar;Fusco, Vincent F.
本研究提出了使用平行板折射率分级的麦克斯韦鱼眼镜头来开发无源反向天线阵列。作为概念验证，选择 10 GHz 的设计频率进行制造和实验。讨论了镜头的设计原理，该原理可在镜头的漏极探针（也称为像点）处实现 85% 的能量流。结果表明，麦克斯韦鱼眼镜头中的图像具有反相位的点对称性，这使得利用该透镜实现被动反向作用成为可能。这种布置比以前的无源反向拓扑更加实用，因为它可以支持与辐射元件的连接数量不受限制，而无需多层技术。在此描述的实现中，交叉极化微带贴片天线阵列连接到透镜结构的源极和漏极探针，以形成反向阵列。描述并实现了选择将天线连接到透镜所需的最佳传输线长度以获得最大再辐射功率的策略。报告了基于本文提出的理论设计考虑的原型高效无源反向阵列的实验结果。
A Maxwell fisheye lens using parallel plate index grading is presented in this study to develop a passive retrodirective antenna array. As a proof-of-concept a design frequency of 10 GHz was selected for fabrication and experiment. The design principals of the lens are discussed, which enables 85% energy flow at the drain probe (also referred to as image point) of the lens. It is shown that the image in the Maxwell fisheye lens has a point symmetry with a reverse phase, which makes it possible to realize passive retrodirective action using the lens. This arrangement is significantly more practical than previous passive retrodirective topologies due to the un-constrained number of connections to radiating elements that it can support without the need for multi-layer technology. In the realization described here, a cross-polarized microstrip patch antenna array is connected to the source and drain probes of the lens structure in order to form the retrodirective array. The strategy for selecting the optimal transmission line lengths required to connect the antennas to the lens for maximum re-radiation power is described and implemented. Experimental results for a prototype high efficiency passive retrodirective array based on the theoretical design considerations presented in this paper are reported.