Application Cases

With the rapid development of wireless communication systems, the demand for antennas in smartphones, RFID systems, and radar is increasing. How to miniaturize, lightweight, and reduce the power consumption of antennas has become a hot topic. Due to the complex environment in media such as seawater, soil, and rocks, the skin depth of high-frequency signals generated by traditional antennas is low and the wavelength is short in these environments. This increases the attenuation and loss of electromagnetic wave signals during transmission, failing to meet the needs of underwater and underground communication and detection. Ultra-low-frequency antennas, which have low working frequencies and strong penetration capabilities, are considered an important solution for miniaturizing ultra-low-frequency antennas. Compared with traditional electrically small antennas, magneto-electric mechanical antennas can reduce the antenna size by two orders of magnitude.

The ATA-2082 high-voltage amplifier from Aigtek, with its linear amplification circuit, features low distortion and high stability. It has dual-channel independent output, capable of driving two loads separately. The bandwidth covers DC-200kHz and supports the amplification of arbitrary waveforms to meet the testing requirements of various experiments.

Experiment Name: Research on Low-Frequency Antennas Based on Magneto-Electric Composite Materials

Experiment Principle:The magneto-electric effect is divided into the direct magneto-electric effect and the converse magneto-electric effect. The direct magneto-electric effect refers to the process where, under an alternating magnetic field, the magnetostrictive layer of the magneto-electric composite material undergoes strain due to the magnetostrictive effect. This strain is transferred to the piezoelectric layer through interfacial coupling, causing it to deform and generate an electric field through the piezoelectric effect, which is the conversion from magnetic energy to mechanical energy and then to electrical energy. The converse magneto-electric effect occurs when an external voltage is applied to the magneto-electric composite material. The piezoelectric layer undergoes strain due to the converse piezoelectric effect, which is transferred to the magnetostrictive layer through interfacial coupling, causing it to deform and generate a magnetic field through the converse magnetostrictive effect, thus completing the conversion from electrical energy to mechanical energy and then to magnetic energy.

Experimental Block Diagram:

Experimental Photograph:

Experimental Process:

Dynamic frequency sweeping method is used for testing. The test environment is set up as shown in the figure. First, the magneto-electric heterojunction sample to be tested is placed in a homemade small solenoid, ensuring that the solenoid covers the sample and the sample is located at the center of the solenoid. Using a LabVIEW program on the computer to control the lock-in amplifier, an alternating voltage is output. The signal is amplified by the ATA-2082 power amplifier and applied to the piezoelectric layer of the magneto-electric heterojunction. The voltage in this circuit is detected by an oscilloscope to ensure that the voltage applied to the sample is accurate and stable. Meanwhile, the lock-in amplifier tests the induced voltage in the solenoid, and the reverse magneto-electric coupling coefficient is automatically calculated by the LabVIEW program and displayed on the computer. During testing, a direct current bias magnetic field can be applied to the sample. Using the LabVIEW program to control the power supply, another Helmholtz coil applies a direct current bias magnetic field.

Application Directions: Wireless Communication

Application Scenarios: Seismic Monitoring, Underwater Communication

Product Recommendation: ATA-2082 High-Voltage Amplifier

Figure: Performance Parameters of the ATA-2082 High-Voltage Amplifier

Figure: Performance Parameters of the ATA-2000 Series High-Voltage Amplifiers

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