A Portable Acoustically Actuated Antenna Based on an Asymmetrical Magnetoelectric Antenna

Abstract

The magnetoelectric (ME) antenna with acoustic driven has become a new scheme for solving remote wireless communication from ultralow frequency (ULF) to very low frequency (VLF) bands due to its small size and antiinterference solid capabilities. This article presents a model based on electrostriction, magnetostriction, and Maxwell equations. The capability at the resonant frequency ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{f}_{\text {r}}$ </tex-math></inline-formula> ) of electric field (E) and magnetic flux density (B) radiation in space are examined through variations in voltage (V), magnetic field (H), and structure. This model relates the V to the spatial B distribution and lays a foundation for the ME antenna’s structural design and characteristic research. The actual test shows the asymmetric ME antenna has excellent electromagnetic (EM) radiation ability in the super low frequency (SLF) band. The magnetic flux intensity can reach 2.2 nT at 1 m. By constructing ME antenna arrays, radiation intensity can also be superimposed. The value of magnetic flux density reaches 7.2 nT at 1 m at 110 Hz and 3.8 nT at 1 m at quasi-static frequency. This study demonstrates that asymmetric ME antenna arrays can be used for narrowband communication in the SLF and broadband long-distance communication.