Extremely-Low Frequency Mechanical Antenna Based on Vibrating Permanent Magnet

Menghao Guo,1

Xi Wen,2 

Shaolong Yang,1

Jianchun Xu,1

Xuchao Pan2 

Ke Bi1*Email

1School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China.

2School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

*E-mail: bike@bupt.edu.cn

**M. Guo and X. Wen contributed equally to this work.

Abstract

Extremely-low-frequency (ELF) communication has stimulated widespread research interest during past years. Up to now, most permanent magnet mechanical antennas usually rotate the magnet to generate electromagnetic waves. Here we demonstrate a new mechanical antenna based on vibrating permanent magnet. This mechanical antenna radiates electromagnetic waves through the reciprocating movement of permanent magnets. Finite element simulations and experiments are applied to verify the radiation characteristics of the vibrating mode mechanical antenna. Compare with the rotating permanent magnet mechanical antenna, this antenna can generate an induced voltage with a peak value of 0.179 mV at 1 m. Both the simulated and experimental results indicate that this mechanical antenna can successfully generate stable time-varying electromagnetic waves in the ELF band. This vibrating mode mechanical antenna paves a way for the design of permanent magnet mechanical antenna.

Extremely-Low Frequency Mechanical Antenna Based on Vibrating Permanent Magnet