As a power supply method with high spatial freedom, megahertz (MHz) wireless power transfer (WPT) has great potential in particular application fields. The role and importance of WPT are described from the perspective of interdisciplinary. This article starts with WPT systems’ performance at different frequencies, emphasizes the basic composition and working principle of MHz systems, and focuses on a comprehensive review of recent years on inverters, rectification, impedance compression, dynamic impedance matching, coupling structure design, and multiload model establishment. Meanwhile, different technologies are summarized, compared, and classified. Current challenges and future development trends are discussed.

中文翻译：

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兆赫无线电力传输概述

作为一种具有高空间自由度的供电方式，兆赫兹（MHz）无线电力传输（WPT）在特定应用领域具有巨大潜力。从跨学科的角度描述了WPT的作用和重要性。本文从WPT系统在不同频率下的性能入手，着重介绍MHz系统的基本组成和工作原理，着重对近年来的逆变、整流、阻抗压缩、动态阻抗匹配、耦合结构设计、多负载等方面进行全面回顾模型建立。同时，对不同的技术进行总结、比较和分类。讨论了当前的挑战和未来的发展趋势。