Application Cases

【Overview】
In this study, the Aigtek ATA-2022B high-voltage amplifier was used to build a radiation experimental system for magnetoelectric-mechanical antennas, verifying the influencing factors and communication performance of the antenna.

Experiment Name: Experiments on Influencing Factors and Communication of Magnetoelectric-Mechanical Antennas

Experiment Objective:
Based on previously established theories of radiation mechanisms and structural design for magnetoelectric-mechanical antennas, this study aims to verify the correctness, feasibility, and effectiveness of the relevant theories and designs. The influence of key factors such as input frequency, radiation directivity, excitation voltage, and communication distance on antenna radiation performance was investigated to determine optimal operating parameters. Very low frequency (VLF) communication with 2FSK direct modulation was achieved using hetero-order controllable bending resonance frequencies, and key performance indicators such as modulation rate and baud rate were tested. A comparison with a copper loop electrically small antenna of the same size was conducted to highlight the significant advantages of the developed magnetoelectric-mechanical antenna in terms of radiation efficiency and bandwidth efficiency under miniaturization constraints.

Testing Equipment:
High-voltage amplifier (Aigtek ATA-2022H), magnetostrictive material, piezoelectric material PZT-5, function signal generator, oscilloscope, magnetic loop receiving antenna, host computer, transmitting antenna.

Experimental Procedure:
An experimental platform was built, including an asymmetric bilayer magnetoelectric composite transmitting antenna (30 mm × 10 mm × 3 mm), a square magnetic loop receiving antenna, a function signal generator, and a high-voltage amplifier. First, the influence of input frequency, radiation directivity, excitation voltage, and communication distance on radiation intensity was investigated. The antenna’s resonance frequency, optimal operating parameters, and the attenuation characteristics of magnetic induction intensity with distance were determined. Subsequently, VLF communication with a modulation rate of 100 Hz and a baud rate of 100 Baud within a 10 m range was achieved using 2FSK direct modulation based on first-order and second-order bending resonance frequencies. Finally, a comparison with a copper loop antenna of the same size confirmed that the radiation efficiency of the magnetoelectric-mechanical antenna is three orders of magnitude higher, and its bandwidth efficiency is 33 times greater, demonstrating its advantages of miniaturization and high efficiency.

Figure 1: System Control Block Diagram

Figure 2: Experimental Platform

Experimental Results:

1. The first-order bending resonance frequency of the antenna was determined to be 7388 Hz, and the second-order bending resonance frequency was 12,410 Hz, with relative errors of less than 0.5% compared to theoretical values. The bending resonance modes exhibit the advantages of low frequency and high efficiency.

2. The radiation directivity of the antenna conforms to the characteristics of an ideal magnetic dipole. The radiation intensity is highest at 0° and 180° in the yoz plane. The near field and far field can be described by third-order and first-order approximations of the magnetic dipole radiation field, respectively.

3. When the excitation voltage was below 60 V, the magnetic induction intensity was linearly related to the voltage. Beyond 60 V, due to saturation of the piezoelectric material, the magnetic induction intensity no longer increased. The experimental values were approximately consistent with the theoretical model.

4. The magnetic induction intensity decayed with the cube of the communication distance. At a maximum distance of 10 m, a magnetic induction intensity of 0.302 pT could still be detected, and effective signals could be extracted after bandpass filtering.

5. Using first-order and second-order bending resonance frequencies, 2FSK direct modulation achieved a modulation rate of 100 Hz and a baud rate of 100 Baud. The time-frequency domain waveforms were consistent with the trend of the control signal.

6. Compared to a copper loop electrically small antenna of the same size, the radiation efficiency of the magnetoelectric-mechanical antenna was three orders of magnitude higher, and its bandwidth efficiency was 33 times greater than that of a copper loop antenna with the same radiation quality factor.

   
   

Figure 3: Modulation Communication Diagram of the Magnetoelectric-Mechanical Antenna

Advantages of Aigtek Amplifiers in This Application:

1. DC–1 MHz wideband coverage – Precisely matches dual-frequency resonance, supporting 2FSK communication.

2. 200 Vp-p high voltage output and finely adjustable gain – Covers the 60 V linear region and clearly reveals PZT saturation characteristics.

3. Dual-channel independent output and low distortion – Supports verification of magnetic dipole radiation directivity and multi-parameter comparative experiments.

Recommended Product: ATA-2022B High-Voltage Amplifier

Figure: ATA-2022B High-Voltage Amplifier Specifications and Parameters