Rotating Magnet-Based Mechanical Antenna for Magnetic Inductive Communications
Xie He, Qiang Zhou, Jianya Zhang
Abstract
Rotating magnet based mechanical antenna (RMBMA) is a new promising paradigm which can significantly reduce both the size and the power consumption of the super-low frequency electromagnetic transmitter. To further reveal the characterizations of RMBMA, this paper investigates the magnetic inductive (MI) communication performance of RMBMA. Initially, this paper introduces the physical and energy conversion models of RMBMA within the framework of 2 Continuous-Phase Frequency Shift Keying-based RMBMA. Subsequently, the induction quality factor and the MI communication path loss of RMBMA in a uniform lossless medium is theoretically derived in the closed form. A numerical simulation is then conducted to compare RMBMA with coil antennas, highlighting the advantages of RMBMA in the super low frequency. Furthermore, the paper explores optimization strategies for the RMBMA magnetic induction communication system, focusing on structural and modulation parameters. Finally, the magnetic induction communication experiments are carried out at 35m and 620m transmission ranges, reliable induction communication is realized at both transmission ranges, and the correctness of the proposed path loss derivation is verified.