Realizing capacitive coupling under seawater is difficult, although the capacitive coupler attracts attention as a promising solution for wireless power and data transfer. The coupler consisting of parallel-plate electrodes (e.g., capacitive coupler) has strong conductive coupling because of the high conductivity of seawater. This study introduces the design of a highly efficient coupler utilizing this phenomenon as a novel method. First, the operational principle of the highly efficient conductive coupler is clarified by comparing it to a conventional conductive coupler. The results reveal the key factor for the high-efficiency design. The design parameters at the maximum available efficiency are derived. The designed coupler is then fabricated. A demonstration shows that the efficiency of over 90% under seawater is achieved at a 20-mm transfer distance and a 1-kW transfer power. The demonstration also shows that power is wirelessly transferred to a camera module via the coupler, with the transferred data recorded by the camera appearing on a laptop computer.

中文翻译：

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用于水下无线电力和数据传输的导电耦合器设计

尽管电容耦合器作为无线电能和数据传输的有前途的解决方案引起了人们的注意，但在海水下实现电容耦合是困难的。由平行板电极组成的耦合器（如电容耦合器）由于海水的高电导率而具有很强的导电耦合。本研究介绍了一种利用这种现象作为一种新方法的高效耦合器的设计。首先，通过将高效导电耦合器与传统导电耦合器进行比较，阐明其工作原理。结果揭示了高效设计的关键因素。推导出最大可用效率下的设计参数。然后制造设计的耦合器。一个演示表明，在 20 毫米的传输距离和 1 千瓦的传输功率下，在海水下实现了 90% 以上的效率。该演示还表明，电源通过耦合器无线传输到相机模块，相机记录的传输数据显示在笔记本电脑上。