This paper presents a rollable metamaterial screen for high-efficiency wireless power transfer (WPT) system based on magnetic resonance coupling, which operates at 4.5 MHz. The rollable metamaterial screen with a fully expanded area of 750 mm × 750 mm is located in the middle between transmitter and receiver coils and focuses the magnetic field and, by such a way, significantly improves power transfer efficiency (PTE). The metamaterial screen can be rolled up, e.g. onto the ceiling when it is not used, and thus does not require any designated space for the screen saving space. A WPT system with the rollable metamaterial screen is designed, fabricated, and characterized. Improved PTE is qualitatively and quantitatively verified by light bulb experiments and vector network analyzer measurements. The PTE of the WPT system with the metamaterial screen increases from 36 to 58.52% and 10.24 to 31.36% for the distances between the transmitter and receiver coils 100 and 150 cm, respectively. The effects of lateral and angular misalignments on the PTE of the WPT system are also studied. Obtained results show that the rollable metamaterial screen improves the PTE even at the misaligned condition.

中文翻译：

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用于基于磁共振耦合的高效无线电能传输的可卷曲超材料屏幕

本文提出了一种用于基于磁共振耦合的高效无线电力传输 (WPT) 系统的可卷曲超材料屏幕，其工作频率为 4.5 MHz。完全展开面积为 750 mm × 750 mm 的可卷曲超材料屏幕位于发射器和接收器线圈之间，可聚焦磁场，从而显着提高功率传输效率 (PTE)。超材料屏幕可以在不使用时卷起，例如卷到天花板上，因此不需要任何指定的屏幕空间来节省空间。设计、制造和表征了具有可卷曲超材料屏幕的 WPT 系统。改进的 PTE 通过灯泡实验和矢量网络分析仪测量进行了定性和定量验证。对于发射器和接收器线圈之间的距离 100 和 150 cm，具有超材料屏幕的 WPT 系统的 PTE 分别从 36% 增加到 58.52% 和 10.24% 到 31.36%。还研究了横向和角度不对中对 WPT 系统 PTE 的影响。获得的结果表明，即使在未对准的情况下，可卷曲的超材料屏幕也能提高 PTE。