Low-frequency mechanical antenna based on piezoelectric-piezomagnetic composite material and manufacturing method thereof

Abstract

The invention provides a low-frequency mechanical antenna based on a piezoelectric-piezomagnetic composite material and a manufacturing method of the low-frequency mechanical antenna. According to the invention, a first piezomagnetic layer and a second piezomagnetic layer are tightly combined with a piezoelectric layer in a chemical bonding mode; the piezoelectric layer is covered with at least two interdigital electrodes; and when signal voltage is applied to the interdigital electrodes, the piezoelectric layer generates an inverse piezoelectric effect and converts a voltage signal into a deformation parameter of the piezoelectric layer. The two piezomagnetic layers and the piezoelectric layer are tightly combined together, the two piezomagnetic layers simultaneously generate mechanical deformation response under the mechanical deformation action of the middle piezoelectric layer, and under the action of piezomagnetic effect characteristics, the mechanical deformation response is converted into oscillation of magnetic dipoles in the two piezomagnetic layers to form magnetic field change and externally radiate a low-frequency electromagnetic field; and a magnetic field change signal is conducted to a signal receiving end, so low-frequency communication with high transmitting power and efficiency is realized, and miniaturization of low-frequency communication equipment is realized.

Description

technical field [0001] The invention belongs to the technical field of magnetoelectric antennas, in particular to a low-frequency mechanical antenna based on piezoelectric-piezomagnetic composite materials and a manufacturing method thereof. Background technique [0002] The development of the "transparent ocean" concept and the establishment of a three-dimensional ocean observation system require long-distance, ground-penetrating, and underwater communication and detection capabilities. Low-frequency electromagnetic waves (3Hz to 30kHz) with strong penetrating ability and long propagation distance must be used as signal carriers. Therefore, the development of very low-frequency electromagnetic wave detection and communication technology is an urgent need for my country's strategy of developing a maritime power. The existing low-frequency antenna adopts an electric excitation mode, and the excitation current oscillates in the antenna to form electromagnetic wave radiation. ...

AI Technical Summary

Problems solved by technology

Among them, the former two use mechanically driven electromagnetic dipole movement to generate electromagnetic signals, the generation and maintenance of the stable strong field source and the limitations of displacement drive technology have always restricted the practical progress of the dipole moving mechanical antenna.

However, the current piezoelectric resonant mechanical antenna generally has the problem of low transmission power and efficiency, which is the biggest obstacle to the practical application of this type of mechanical antenna. The magnetic field signal generated at the distance only reaches 0.1fT, which is far from the requirement of signal penetration ability for transmission power

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