Reciprocal Optimized Surface Impedance Multiple Angle Retro-Reflective Metasurfaces

Mohammed Kalaagi, D. Seetharamdoo
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Abstract

In this paper, we introduce a reciprocal multiple angle retro-reflective metasurface following the general principles of the surface impedance concept and numerical optimization of the super-cell design. The aim is to obtain retroreflection simultaneously at the desired direction and open channels of the designed metasurface. With an increase of periodicity of the super-cell design, the number of open channels increases according to Floquet-BLoch analysis. With an increase up to $\mathbf{2}\lambda$ and higher the system is said to become very lossy and loses its reciprocity in the symmetrical directions. In this particular case, a new design super-cell approach for a reciprocal retrodirective metasurface is studied for a periodicity of $\mathbf{2.9}\lambda$ at a 10° incident angle. For the validation of the analysis and performance of the designed metasurface, the monostatic RCS is given to determine the performance of the metasurface for retro-reflection. The results show significant levels at the desired angle (10°) and open channels (−32° and −44°), as well as a recovery of the loss in the symmetrical directions (−10°, 32° and 44°) using the reciprocal metasurface design approach.
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互反优化表面阻抗多角度反反射超表面
本文根据表面阻抗概念的一般原理和超级电池设计的数值优化,介绍了一种互反多角度反反射超表面。目的是在设计的超表面的期望方向和开放通道上同时获得反向反射。根据Floquet-BLoch分析,随着超级电池设计周期的增加,开放通道的数量也随之增加。当增加到$\mathbf{2}\lambda$或更高时,系统会变得非常有损耗,并且在对称方向上失去互易性。在这种特殊的情况下,研究了一种新的设计超级单元的方法,用于在10°入射角下的周期$\mathbf{2.9}\lambda$。为了验证所设计的元表面的分析和性能,给出了单稳态RCS来确定元表面的反向反射性能。结果表明,在所需角度(10°)和开放通道(- 32°和- 44°)处的损耗水平显著,并且使用互易超表面设计方法可以恢复对称方向(- 10°,32°和44°)的损耗。
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