Full Manipulation of the Power Intensity Pattern in a Large Space‐Time Digital Metasurface: From Arbitrary Multibeam Generation to Harmonic Beam Steering Scheme,Annalen Der Physik

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Full Manipulation of the Power Intensity Pattern in a Large Space‐Time Digital Metasurface: From Arbitrary Multibeam Generation to Harmonic Beam Steering Scheme
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-09-06 , DOI: 10.1002/andp.202000321
Javad Shabanpour ₁

Affiliation

Beyond the scope of space‐coding metasurfaces, space‐time digital metasurfaces can substantially expand the application scope of digital metamaterials. In this paper, by adopting a superposition operation of terms with unequal coefficients, Huygens' principle, and a proper time‐varying biasing mechanism, some useful closed‐form formulas in the class of large digital metasurfaces are presented for predicting the absolute directivity of scatted beams. Moreover, in the harmonic beam steering scheme, by applying several suitable assumptions, two separate expressions are derived for calculating the exact total radiated power at harmonic frequencies and total radiated power for scattered beams located at the end‐fire direction. Despite the simplifying assumptions applied, it is proved that the provided formulas can still be a good and fast estimate for developing a large digital metasurface with a predetermined power intensity pattern. The effect of quantization level and metasurface dimensions as well as the limitation on the maximum scan angle in harmonic beam steering are addressed. Several demonstrative examples numerically demonstrated through MATLAB software and the good agreement between simulations and theoretical predictions are observed. The author believes that the proposed straightforward approach discloses a new opportunity for various applications such as multiple‐target radar systems and communication.

中文翻译：

在大时空数字超表面上完全控制功率强度模式：从任意多光束生成到谐波束转向方案

除了空间编码超颖表面的范围外，时空数字超颖表面还可以大大扩展数字超材料的应用范围。本文采用系数不相等的项的叠加运算，惠更斯原理和适当的时变偏置机制，提出了一些有用的大数字超曲面类别的闭式公式，以预测散斑的绝对方向性。梁。此外，在谐波波束控制方案中，通过应用几个合适的假设，得出了两个单独的表达式，用于计算谐波频率下的确切总辐射功率和位于末火方向的散射波束的总辐射功率。尽管采用了简化的假设，事实证明，所提供的公式仍然可以作为开发具有预定功率强度模式的大型数字超表面的良好而快速的估计。解决了谐波束控制中量化级和超表面尺寸的影响以及最大扫描角度的限制。通过MATLAB软件数值演示了几个示例，并观察到仿真与理论预测之间的良好一致性。作者认为，所提出的直接方法为诸如多目标雷达系统和通信之类的各种应用提供了新的机会。解决了谐波束控制中量化级和超表面尺寸的影响以及最大扫描角度的限制。通过MATLAB软件数值演示了几个示例，并观察到仿真与理论预测之间的良好一致性。作者认为，所提出的直接方法为诸如多目标雷达系统和通信之类的各种应用提供了新的机会。解决了谐波束控制中量化级和超表面尺寸的影响以及最大扫描角度的限制。通过MATLAB软件数值演示了几个示例，并观察到仿真与理论预测之间的良好一致性。作者认为，所提出的直接方法为诸如多目标雷达系统和通信之类的各种应用提供了新的机会。

更新日期：2020-10-11

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