Leung Chung Ming, Zheng Haoran, Yang Jing, Wang Tao, Wang Feifei
School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China.
Education Center of Experiments and Innovations, Harbin Institute of Technology, Shenzhen 518055, China.
Sensors (Basel). 2024 Jan 22;24(2):694. doi: 10.3390/s24020694.
VLF magneto-electric (ME) antennas have gained attention for their compact size and high radiation efficiency in lossy conductive environments. However, the need for a large DC magnetic field bias presents challenges for miniaturization, limiting portability. This study introduces a self-biased ME antenna with an asymmetric design using two magneto materials, inducing a magnetization grading effect that reduces the resonant frequency during bending. Operating principles are explored, and performance parameters, including the radiation mechanism, intensity and driving power, are experimentally assessed. Leveraging its excellent direct and converse magneto-electric effect, the antenna proves adept at serving as both a transmitter and a receiver. The results indicate that, at 2.09 mW and a frequency of 24.47 kHz, the antenna has the potential to achieve a 2.44 pT magnetic flux density at a 3 m distance. A custom modulation-demodulation circuit is employed, applying 2ASK and 2PSK to validate communication capability at baseband signals of 10 Hz and 100 Hz. This approach offers a practical strategy for the lightweight and compact design of VLF communication systems.
甚低频磁电（ME）天线因其在有损导电环境中的紧凑尺寸和高辐射效率而受到关注。然而，需要大的直流磁场偏置对小型化提出了挑战，限制了便携性。本研究介绍了一种采用两种磁性材料的不对称设计的自偏置ME天线，该设计会产生磁化梯度效应，从而降低弯曲过程中的谐振频率。研究了其工作原理，并通过实验评估了包括辐射机制、强度和驱动功率在内的性能参数。利用其优异的正逆磁电效应，该天线被证明既适合用作发射器也适合用作接收器。结果表明，在2.09 mW和24.47 kHz的频率下，该天线在3 m距离处有可能实现2.44 pT的磁通密度。采用了定制的调制解调电路，应用2ASK和2PSK来验证在10 Hz和100 Hz基带信号下的通信能力。这种方法为甚低频通信系统的轻量化和紧凑设计提供了一种实用策略。
