Modeling of the near-field radiation of acoustically actuated magnetoelectric antennas.

This paper presents an analytical model for the near-field radiation of acoustically actuated magnetoelectric (ME) antennas considering a fully magneto-elastic coupled magnetostrictive constitutive relation. The nonlinearity of the magnetostrictive phase is introduced into the governing equation of the ME antennas using the equivalent parameter method, resulting in analytical expressions of the near-field radiation. The strain distribution in the ME antenna is calculated first and then extracted as a source for solving the magnetic flux density, energies, average radiated power, and radiation impedance. The predictions for the admittance and impedance show good agreement with simulation and experimental data, respectively. The effects of the external stimuli on the radiation performance are investigated, to theoretically evaluate the ME antennas operated in complex magnetic and stress conditions. The required magnetic bias corresponding to the maximum radiation of the ME antennas is determined, which is changed with the pre-stress. In addition, the radiation power can be improved by tensile stress before the required magnetic bias or by compressive stress after the required magnetic bias. The present model may provide a basis for the evaluation and regulation of acoustically actuated ME antenna. [ABSTRACT FROM AUTHOR]