Analysis of Radiation Characteristics on Rotating-magnet Based Mechanical Antenna

This paper investigates the radiation characteristics of rotating-magnet based mechanical antenna (RMBMA). The electro-mechanical-electromagnetic energy conversion of RMBMA is analyzed. When 2FSK modulation is adopted, the influence of the step response characteristics of the magnetic source rotation motion is derived. Thus the radiation power, magnetic source loss and radiation efficiency of RMBMA in uniform and lossless media can be calculated. This is extended to the radiation efficiency comparison of RMBMA and traditional loop antennas. The simulation results show that RMBMA has significant performance advantages in the frequency band below kHz.