Application Cases

Experiment Name: Research on Antenna Vibration Mode Characterization

Testing Equipment: ATA-2041 high-voltage amplifier, laser vibrometer, antenna, etc.

Experimental Procedure:

Figure 1: Vibration Mode Testing Platform

The vibration mode testing platform, constructed using a laser vibrometer and Aigtek’s ATA-2041 high-voltage amplifier, is shown in Figure 1. The antenna is fixed on a flat plate, and three laser beams are simultaneously directed at a single point on the antenna to measure its resonant displacement. The laser vibrometer is used to measure the vibration mode, while Aigtek’s ATA-2041 high-voltage amplifier provides high-voltage excitation to drive the antenna into resonance. Due to the frequency bandwidth limitations of the power amplifier, this study focuses only on the modal characterization of bending resonance, length shear wave resonance, and width Lamb wave resonance.

Experimental Results:

Figure 2: Frequency Sweep Analysis Results

The frequency sweep results are shown in Figure 2. The three curves in the figure represent the motion velocities in the X, Y, and Z directions. Due to the limited frequency bandwidth of the power amplifier, the resonant peak along the thickness direction could not be detected. As shown in the figure, three distinct resonant peaks appear at 26.87 kHz, 42 kHz, and 188.54 kHz, corresponding to bending resonance, length shear wave resonance, and width Lamb wave resonance, respectively. Numerous spurious resonances are also observed in the surrounding frequency range, but only the main resonances need to be identified.

Figure 3: Comparison of Measured and Simulated Vibration Mode Diagrams for Three Resonance Modes (a) Measured Bending Resonance (b) Measured Length Shear Wave Resonance (c) Measured Width Lamb Wave Resonance (d) Simulated Bending Resonance (e) Simulated Length Shear Wave Resonance (f) Simulated Width Lamb Wave Resonance

By applying sinusoidal signals at 26.87 kHz, 42 kHz, and 174.72 kHz, vibration mode diagrams for three different operating modes were obtained, as shown in Figure 3. The measured results generally reflect the simulation outcomes. The vibration mode cloud diagram for length shear wave resonance differs slightly from the simulation results, which may be due to inaccurate point selection. However, the dynamic diagram confirms that the resonance corresponds to length shear wave resonance. The vibration mode diagram for width Lamb wave resonance aligns well with the simulation results. Inaccurate data in the upper-left corner is attributed to prolonged vibration causing antenna displacement and affecting point selection accuracy.

Voltage Amplifier Recommendation: ATA-2041

Figure: ATA-2041 High-Voltage Amplifier Specifications

The experimental materials in this article are compiled and published by Xi’an Aigtek Electronics. For more experimental solutions, please continue to follow the Aigtek official website.