Application Cases

Very Low Frequency (VLF, 3 kHz - 30 kHz) electromagnetic waves have characteristics such as good concealment, strong anti-interference capability, and long propagation distance. They have irreplaceable application prospects in underwater messaging communication and through-the-earth communication. However, VLF signals have long wavelengths, and to achieve effective electromagnetic radiation, the transmission systems have to be large-scale. Moreover, the transmitting antennas are generally electrically small antennas with limited radiation efficiency. To address the issues of large antenna size, low radiation efficiency, and high energy consumption in existing VLF systems, the design of small-sized and high-efficiency antennas has become a challenge in the field of VLF antennas.

Regarding experimental research on the design of VLF antennas mediated by bending resonance acoustic frequencies, the ATA-2000 series of high-voltage amplifiers from Antai Electronics has been widely used in this field. They can output an alternating voltage of up to 1600 Vpp with a maximum output current of 500 mA, which can meet the requirements of most experimental tests.

Experiment Name: Design Experiment of VLF Magneto-Electric Antennas Mediated by Asymmetric Bending Resonance Acoustic Frequencies

Experiment Principle: The excitation electrical signal generated by the signal generator is sent to the high-voltage amplifier, which then voltage-excites the magneto-electric composite structure to produce VLF electromagnetic waves. These waves are received by a toroidal receiving coil, and the signal is transmitted and processed through an oscilloscope to obtain the VLF signal and complete the communication.

Experiment Block Diagram:

Experiment Photographs:

Experiment Process: The transmitting antenna consists of a double-layer composite magneto-electric material and a magnet. The magnet is placed in the magnetization direction of the antenna to provide a bias magnetic field. The optimal bias magnetic field required for the transmitting antenna is generated by adjusting the spacing of the magnets. The excitation electrical signal is sent from the signal generator to the high-voltage amplifier, which excites the magneto-electric composite structure to produce VLF electromagnetic waves, thereby achieving the transmission of VLF electromagnetic waves and the loading of information. The VLF signal is received by the toroidal receiving coil, and the signal is transmitted and processed through the oscilloscope to the upper computer to complete the communication.

Application Directions: Communication, embedded antennas, communication chips, implantable medical instruments

Application Scenarios: Miniaturized antennas, mechanical antennas, VLF electromagnetic wave communication, bending resonance, magneto-electric coupling effect

Voltage Amplifier Recommendation: ATA-2000 Series High-Voltage Amplifiers

Figure: Specifications of the ATA-2000 Series High-Voltage Amplifiers