Analytical solutions for full-field radiations of magnetoelectric antennas with nonlinear magnetoelastic coupling.

This paper presents analytical solutions for full-field radiation in magnetoelectric (ME) antennas, considering a fully magneto-elastic coupled constitutive relation. A nonlinear converse ME coupling model is established, incorporating mechanical, electric, and magnetic variables with generalized Maxwell equations. This model emphasizes the essence of ME antennas, where radiation is achieved through strain/stress-mediated coupling between different phases. The magnetic flux density and electric displacement obtained from the model are used as sources to solve the full-field radiations of ME antennas. The proposed model is validated through existing experiments and simulations, demonstrating that the radiation performance of ME antennas is strongly influenced by nonlinear magneto-elastic coupling. The material parameters and magnetic bias significantly impact the magnetic flux density and far-field radiation due to the nonlinear magnetization process. The study reveals the mechanisms behind enhanced working bandwidth and frequency tuning by examining the frequency response of the radiation impedance with material parameters. By adjusting the initial magnetization rate, saturation magnetostriction, and saturation magnetization, the radiation efficiency/gain can be increased by 340%, 108%, and 112% respectively. This model enhances our understanding of the full-field radiation of ME antennas and provides a foundation for designing tunable ME antennas. [ABSTRACT FROM AUTHOR]