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Tunable Perfect Anomalous Reflection Using Passive Aperiodic Gratings

arXiv (Cornell University)(2023)

Cited 1|Views18
Abstract
Realizing continuous sweeping of perfect anomalous reflection in a wide angular range has become a technical challenge. This challenge cannot be overcome by the conventional aperiodic reflectarrays and periodic metasurfaces or metagratings. In this paper, we investigate means to create scanning reflectarrays for the reflection of plane waves coming from any direction into any other direction without any parasitic scattering. The reflection angle can be continuously adjusted by proper tuning of reactive loads of each array element, while the geometrical period is kept constant. We conceptually study simple canonical two-dimensional arrays formed by impedance strips above a perfectly reflecting plane. This setup allows fully analytical solutions, which we exploit for understanding the physical nature of parasitic scattering and finding means to overcome fundamental limitations of conventional reflectarray antennas. We propose to use subwavelength-spaced arrays and optimize current distribution in $\lambda/2$-sized supercells. As a result, we demonstrate perfect tunable reflection to any angle. Our work provides an effective approach to design reconfigurable intelligent surfaces with electrically tunable reflection angles.
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tunable perfect anomalous reflection
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要点】:本文提出了一种利用被动非周期光栅实现完美异常反射角连续调节的方法,克服了传统非周期反射阵列和周期性元表面在宽角度范围内连续调节反射角的难题。

方法】:通过适当调整每个阵列元素的 reactive loads 来连续调节反射角,同时保持几何周期不变。

实验】:使用亚波长间隔的阵列并优化 $\lambda/2$-尺寸超单元中的电流分布,实验证明了到任意角度的完美可调反射。论文中未提及具体的数据集名称。