Application Cases

Experiment Name: Wireless Transmission Testing of Mechanical Antennas

Research Direction: Low-Frequency Antennas

Experiment Content: Signal modulation and transmission of mechanical antennas, transmission distance testing, and measurement of radiation power and efficiency. The experiment employs ASK (Amplitude-Shift Keying) modulated signals to feed the mechanical antenna for low-frequency ASK signal transmission and tests the maximum transmission distance of low-frequency signals. Additionally, instruments such as a spectrum analyzer are used to measure the transmission power and radiation efficiency of the mechanical antenna to verify its radiation performance.

Testing Equipment: ATA-4052 high-voltage power amplifier, arbitrary function generator, magnetic loop antenna, phase-locked amplifier, spectrum analyzer, etc.

Figure: Schematic diagram of the wireless transmission testing experiment of mechanical antennas

Figure: Photographs of the wireless transmission testing experiment of mechanical antennas

Experiment Process:

1. Signal Modulation and Transmission: The experiment adopted an ASK modulation scheme. An arbitrary function generator and power amplifier were used to modulate and amplify the input signal, generating an ASK signal with a 50% duty cycle, which was directly fed into the electrodes of the mechanical antenna. Simultaneously, a phase-locked amplifier was used at the receiving end to measure the received signal.

2. Transmission Distance Testing: The mechanical antenna transmitted modulated signals at frequencies of 20 kHz, 200 kHz, and 700 kHz, and the maximum transmission distance of the signals was measured.

3. Radiation Power and Efficiency Measurement: The experiment utilized current probes, oscilloscopes, and spectrum analyzers to directly measure the input current, input voltage, and received power, thereby calculating the radiation power and efficiency.

   

   
   

Test Results:

1. Successful communication over a distance of 200 meters was achieved under ASK modulation, with a magnetic field strength reaching 0.34 pT.

2. The measured radiation efficiency ranged from 2.70E-8 to 5.66E-7, which is 2-3 times higher than previously reported values. The experimental results validated the characteristics of electrostrictive mechanical antennas in ultra-wideband and long-distance transmission, providing a hardware foundation for long-wave communication.

Power Amplifier Recommendation: ATA-4052C High-Voltage Power Amplifier

Figure: Specifications of the ATA-4052C High-Voltage Power Amplifier