arXiv 2004.069172020-04-15physics.app-ph

用于波束控制的可编程元表面的可扩展性分析

Scalability Analysis of Programmable Metasurfaces for Beam Steering

Hamidreza Taghvaee, Sergi Abadal, Alexandros Pitilakis, Odysseas Tsilipakos, Anna Tasolamprou, Christos K Liaskos, Maria Kafesaki, Nikolaos V. Kantartzis, Alber… 展开作者

Hamidreza Taghvaee, Sergi Abadal, Alexandros Pitilakis, Odysseas Tsilipakos, Anna Tasolamprou, Christos K Liaskos, Maria Kafesaki, Nikolaos V. Kantartzis, Albert Cabellos-Aparicio, Eduard Alarcón

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摘要：

可编程超表面已经获得了极大的关注，因为它们赋予了对任何表面的电磁响应的前所未有的控制。这样的特征已经引起了新的设计范例，如软件定义的超材料（SDM）和可重构智能表面（RIS）与多个突破性的应用。然而，可编程元表面的开发定制的一个潜在的广泛的应用程序池的特殊性成为一项艰巨的任务，因为设计空间变得非常大。本文旨在通过提出一种方法来简化设计过程，该方法通过元表面响应的半分析模型，允许导出性能缩放趋势作为一组代表性设计变量的函数。虽然该方法适用于任何电磁功能，但本文探讨了其在5G应用中26 GHz波束转向的情况。传统的波束转向度量被评估为针对不同入射角和反射角的单位单元尺寸、单位单元状态的数量和超颖表面尺寸的函数。示出了具有$λ/3$的单位单元和四个单位单元状态的元表面5 $λ\times$ 5 $λ$或更大确保了良好的整体性能。此外，它表明，性能显着下降的角度大于$θ> 60^o$，并打击这一点，需要额外的努力，在发展的单位细胞。这些性能趋势与功耗和成本模型相结合，将为优化元表面尺寸铺平道路。

英文摘要：

Programmable metasurfaces have garnered significant attention as they confer unprecedented control over the electromagnetic response of any surface. Such feature has given rise to novel design paradigms such as Software-Defined Metamaterials (SDM) and Reconfigurable Intelligent Surfaces (RIS) with multiple groundbreaking applications. However, the development of programmable metasurfaces tailored to the particularities of a potentially broad application pool becomes a daunting task because the design space becomes remarkably large. This paper aims to ease the design process by proposing a methodology that, through a semi-analytical model of the metasurface response, allows to derive performance scaling trends as functions of a representative set of design variables. Although the methodology is amenable to any electromagnetic functionality, this paper explores its use for the case of beam steering at 26 GHz for 5G applications. Conventional beam steering metrics are evaluated as functions of the unit cell size, number of unit cell states, and metasurface size for different incidence and reflection angles. It is shown that metasurfaces 5$λ\times$5$λ$ or larger with unit cells of $λ/3$ and four unit cell states ensure good performance overall. Further, it is demonstrated that performance degrades significantly for angles larger than $θ> 60^o$ and that, to combat this, extra effort is needed in the development of the unit cell. These performance trends, when combined with power and cost models, will pave the way to optimal metasurface dimensioning.

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