Temperature Dependence of Magnetoelectric Coupling Effect in Magnetoelectric Antenna

The magnetoelectric (ME) antenna operating in very low frequency (VLF) and low frequency (LF) has become a new scheme for solving remote communication problems in special environments such as underwater and underground, owing to its small size. In actual tests, the operating temperature is a significant factor affecting the performance. In this work, we built a nonlinear magneto-thermal coupling model for the near-field radiation of the ME antenna. The model relates temperature to the magnetization, strain, stress, as well as the electric and magnetic fields in space. The radiation performance under different temperatures was discussed. The result shows that by setting an appropriate temperature, the radiation ability can be significantly improved. The radiation intensity reaches 16.7 nT at 15 Vrms at 1 m increased by 48.7% via increasing the operating temperature from 0 °C to 60 °C. At the same time, the maximum radiation distance reaches 5.49 m increased by 17.5%. In addition, the hysteretic phenomena are weak at low-temperature environments, and the ME antenna can maintain a linear resonance under a driving voltage ranging from 5 Vrms to 25 Vrms.