Application Cases

【Overview】
In this study, the Aigtek ATA-4052C high-voltage power amplifier was used to build a wireless transmission test system for magnetically coupled resonant antennas. The research presents a magnetically resonant coupled metamaterial (MRCM) antenna featuring high radiation capacity, frequency tunability, directional adjustability, and compact size. Equivalent circuit models and electromagnetic simulations were conducted to elucidate its radiation mechanism and frequency modulation capability. Compared to conventional loop antennas, the MRCM antenna can achieve a sevenfold increase in radiated magnetic flux density and extend the effective magnetic transmission distance by a factor of three. Furthermore, the MRCM antenna allows adjustment of radiation direction and operating frequency, enhancing its versatility for various application scenarios. This metamaterial antenna design enables a pocket-sized antenna to achieve an effective communication range of 180 meters, offering a promising solution for improving communication capabilities in changing environments such as underwater and underground.

Experiment Name: Wireless Transmission Testing of Magnetically Coupled Resonant Antennas

Research Direction: Low-Frequency Communication

Experimental Content:
At the transmitting end, a signal generated by a signal generator is amplified by the power amplifier and fed into the magnetically coupled resonant antenna, thereby radiating a magnetic field. At the receiving end, an active loop antenna converts the received magnetic field signal into an electrical signal. The time-domain and frequency-domain characteristics of the received signal are analyzed using a lock-in amplifier and a spectrum analyzer, respectively.

Testing Equipment: ATA-4052C high-voltage power amplifier, arbitrary function generator, active loop antenna, lock-in amplifier, spectrum analyzer, etc.

Experimental Procedure:

Figure 1: Experimental Test System Diagram

1. Spectrum testing: First, a frequency sweep signal is generated by the arbitrary function generator and amplified by the power amplifier. The amplified signal is fed into the antenna. The frequency-domain signal received by the spectrum analyzer is recorded and analyzed to complete the frequency response testing of the magnetically coupled resonant antenna.

2. Long-distance transmission testing: Signal modulation is performed first, using an ASK modulation scheme. The arbitrary function generator generates an ASK signal with a 50% duty cycle. The power amplifier amplifies the voltage (current) of the modulated signal to the maximum limit of the instruments. The high-power signal is fed into the antenna. The receiving position is moved based on the distortion level of the time-domain signal received by the lock-in amplifier to measure the maximum effective transmission distance.

Experimental Results:

Figure: Experimental Results

1. The magnetic field radiation of the magnetically coupled resonant antenna is significantly enhanced at the resonance frequency, being seven times that of a conventional loop antenna under the same test conditions.

2. With an input power of 200 W, a long-distance transmission of 180 meters was successfully achieved, which is three times the distance of a conventional loop antenna.

Advantages of Aigtek Amplifiers in This Application:

1. High output power capability – Core guarantee for achieving long-distance transmission.

2. Wide bandwidth coverage and flat frequency response – Ensures the accuracy of frequency sweep testing.

3. High linearity and low waveform distortion – Guarantees the integrity of signal transmission.

Recommended Product: ATA-4052C High-Voltage Power Amplifier

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