Super Low Frequency Transmitting System Based on Mechanical Antenna with Horizontal Rotating Magnet Array

This paper presents a horizontal rotating magnet based on mechanical antenna array method in super low frequencies to improve the radiation magnetic field strength. The array model is first discussed. Moreover, the prototype is developed. The proposed array can produce a 2.75nT magnetic field signal at the distance of 50m in the air, the corresponding effective value is achievable <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$852.39\text{pT}/\sqrt{}\text{Hz}$</tex>. Finally, compared with single horizontal rotating magnetic source, the experiments verify that the o radiation magnetic field strength can be improved by 83%. This method can be used to extend the communication distance of mechanical antenna.