The metasurface-based concept of a smart table for wireless power transfer (WPT) has been recently proposed and experimentally proven to be capable of transferring energy to 1 m with high efficiency. However, in reality, we usually encounter the need to transfer energy to several receivers and with the presence of various obstacles. Herein, we explore the capabilities of the smart table scenario in charging multiple receivers simultaneously. It is demonstrated numerically that the total WPT efficiency as high as 90% to both receivers can be obtained in a wide range of the operational distance. Also, we study the system performance in presence of different types of obstructions in vicinity of the smart table. We demonstrate that in many practical cases dielectric and metallic obstructions do not reduce the WPT efficiency much owing to the surface mode localization and symmetry. Our findings make the metasurface-based smart table system one step closer to the real-life applications.

最近提出了基于表面的无线功率传输智能表（WPT）的概念，并通过实验证明其能够将能量高效传输至1 m。但是，实际上，我们通常遇到将能量传输到多个接收器的需求，并且存在各种障碍。在本文中，我们探讨了智能表方案在同时为多个接收器充电时的功能。数值证明，在较宽的工作距离范围内，两个接收器的总WPT效率均高达90％。此外，我们研究智能表附近存在不同类型障碍物时的系统性能。我们证明，在许多实际情况下，由于表面模式的局限性和对称性，电介质和金属障碍物不会降低WPT效率。我们的发现使基于元表面的智能表系统更接近于实际应用。