Cheng Zhi, Wang Xiangyi, Lv Xiangmeng, Sun Jianming, Chu Zhaoqiang, Zhou Jing, Dong Shuxiang
College of Mechatronics, and Control Engineering and Institute for Advanced Study, Shenzhen University, Shenzhen, China.
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China.
Nat Commun. 2025 May 3;16(1):4137. doi: 10.1038/s41467-025-59539-y.
Traditional MHz and GHz electromagnetic antennas face challenges of high attenuation rate in cross-medium communication; while mechanical antennas are hindered by their large size, high energy consumption and weak radiation capacity. Here, we report a centimeter-scale, wearable ultrasonically-actuated magnetic-dipole rotating resonator (UA-MDRR) for efficient extremely low frequency (ELF) electromagnetic wave transmission in extreme environments. The UA-MDRR employs a small multilayer piezoelectric ceramic (0.11 cm³) to rotate a disc-type NdFeB magnet, generating ELF radiation through an electro-mechanical-magnetic (EMM) coupling effect. This device achieves a high emission capacity of 24,000 nT/cm³@1 m, outperforming the state-of-the-art resonators/antennas by one to two orders of magnitude. It can emit a magnetic field strength of 2.64 pT in air and 2.12 pT underwater at 100 m, respectively, while consuming only 0.61 W of power. This innovation represents a groundbreaking advancement in cross-medium communication, offering a mobile wearable device for emergency communication in seawater for life saving.
传统的兆赫兹和吉赫兹电磁天线在跨介质通信中面临高衰减率的挑战；而机械天线则受到其尺寸大、能耗高和辐射能力弱的阻碍。在此，我们报告了一种厘米级的可穿戴超声驱动磁偶极旋转谐振器（UA-MDRR），用于在极端环境中高效传输极低频（ELF）电磁波。UA-MDRR采用小型多层压电陶瓷（0.11 cm³）来旋转盘式钕铁硼磁体，通过机电磁（EMM）耦合效应产生ELF辐射。该装置在1米处实现了24,000 nT/cm³的高发射能力，比现有最先进的谐振器/天线性能高出一到两个数量级。它在空气中100米处可发射2.64 pT的磁场强度，在水下100米处可发射2.12 pT的磁场强度，而功耗仅为0.61 W。这一创新代表了跨介质通信的一项突破性进展，为海水救生应急通信提供了一种可移动的可穿戴设备。
