This article proposes an optimal design of the kilohertz (kHz)-metamaterial for wireless power transfer (WPT) systems with comprehensive consideration of parameters of the metamaterial. Taking advantage of the left-handed characteristics, the transmission performance can be extensively enhanced when the resonance frequency of the WPT system coincides with the metamaterial. However, the frequency of the existing metamaterial is normally at the range of megahertz, which is not applicable to the high-power WPT system due to the frequency limitation of power switching devices. In view of this, this article carries out the quantitative analysis of the impact of key structure parameters on the frequency where the left-handed characteristic exists. In addition, a general design procedure is proposed to realize the negative permeability at the range of kHz. Finally, the simulated and experimental results are both given to verify the feasibility of the proposed design scheme and show significant meanings for the utilization of metamaterials in relatively high power-level applications, such as the in-flight wireless charging for drones.

中文翻译：

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用于无线电力传输的kHz-超材料的分析与设计

本文提出了一种用于无线电力传输 (WPT) 系统的千赫 (kHz) 超材料的优化设计，综合考虑了超材料的参数。利用左手特性，当WPT系统的共振频率与超材料重合时，传输性能可以得到广泛的提高。然而，现有超材料的频率通常在兆赫兹范围内，由于功率开关器件的频率限制，不适用于大功率WPT系统。鉴于此，本文对关键结构参数对左手特性存在频率的影响进行了定量分析。此外，提出了一种通用设计程序来实现 kHz 范围内的负磁导率。最后，通过仿真和实验结果验证了所提出设计方案的可行性，并对超材料在相对高功率水平的应用中的利用具有重要意义，例如无人机的飞行无线充电。