Transceiving signals by mechanical resonance: A low frequency (LF) magnetoelectric mechanical antenna pair with integrated DC magnetic bias

TL;DR

This paper introduces a miniaturized low-frequency magnetoelectric mechanical antenna pair that leverages mechanical resonance, significantly reducing size and enabling practical IoT and portable electronics communication over several meters.

Contribution

The work presents a novel LF antenna design based on magnetoelectric resonance, achieving four orders of magnitude size reduction and integrated magnetic bias for enhanced performance.

Findings

Maximum operation distance of 9m with magnetic bias

Operation distance of 4m without magnetic bias

Size reduction by four orders of magnitude compared to electrical antennas

Abstract

Low frequency communication systems offer significant potential in portable electronics and internet of things (IoT) applications due to the low propagation loss and long transmission range. However, because the dimension of electrical antenna is comparable to one quarter wavelength of the electromagnetic wave that it transmits and receives, currently a gap exists between LF communication systems and IoT, as IoT generally implement miniaturized electrical antennas with a small wavelength at a high frequency while traditional LF electrical antennas are too bulky. In this paper, we present an LF magnetoelectric mechanical transmitting and receiving antenna pair to significantly miniaturize the dimension of LF antennas. As the operation principle of the magnetoelectric mechanical antenna pair is based on mechanical resonance, its dimension is reduced by four orders of magnitude compared with an electrical antenna counterpart. The transmitting and receiving antennas are the same in structure and dimensions: they are both composed of magnetostrictive Terfenol-D and piezoelectric PZT laminate, and their dimensions are both 38x12x8.2mm3. Both the transmitting and receiving antennas are integrated with DC magnetic bias to improve its performance. Antenna pair performance measurement demonstrates that a maximum operation distance of 9m is demonstrated with DC magnetic bias, while maximum operation distance without DC magnetic bias is 4m, which is reduced by 56%. The LF magnetoelectric mechanical antenna pair may be a promising candidate for the portable electronics and IoT applications.