A low-frequency mechanical antenna based on piezoelectric-piezomagnetic composite material and its manufacturing method

Abstract

The present invention provides a low-frequency mechanical antenna based on a piezoelectric-piezomagnetic composite material and a manufacturing method thereof. The first piezoelectric layer and the second piezoelectric layer are closely combined with the piezoelectric layer through chemical bonding, so that The piezoelectric layer is covered with at least two interdigital electrodes, and when a signal voltage is applied to the interdigital electrodes, the piezoelectric layer produces an inverse piezoelectric effect, converting the voltage signal into a deformation parameter of the piezoelectric layer . The two piezoelectric layers are closely combined with the piezoelectric layer. Under the mechanical deformation of the middle piezoelectric layer, the two piezoelectric layers also produce mechanical deformation responses at the same time. Under the action of the piezoelectric effect characteristics, this mechanical deformation response is In the piezoelectric layer, the oscillation of magnetic dipoles is transformed, forming a magnetic field change, radiating a low-frequency electromagnetic field, and transmitting the magnetic field change signal to the signal receiving end, thereby realizing low-frequency communication with high transmission power and efficiency, and realizing low-frequency communication. Equipment miniaturization.

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. ...

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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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