Application Cases

Experiment Name: Application of Power Amplifiers in the Generation of Time-Modulated Sequences

Research Direction: Electromagnetic Materials

Experiment Content: The experiment involves generating periodic temporal voltage signals to control the periodic conduction/switching off of diodes, thereby modulating the incident electromagnetic waves.

Testing Equipment: Signal generator, ATA-D60090 power amplifier, microwave anechoic chamber, etc.

Experiment Process:

1. A computer generates the time-encoded sequences required for beam scanning. Based on these time-encoded sequences, the square wave signals produced by the arbitrary signal generator are amplified by the power amplifier to generate control voltage signals.

2. The voltage signals control the operating state of the diodes in the electromagnetic material, enabling dynamic control of electromagnetic wave radiation and scattering. The signals are received by a receiving antenna, and the vector network analyzer analyzes the signals to test the electromagnetic material's modulation effect on electromagnetic waves.

Test Results:

1. By co-encoding amplitude and phase and suppressing harmonics, low-sidelobe dynamic beam scanning was achieved. By uniformly distributing energy across harmonics, ultra-low scattering was realized across the full spectral range in the angular domain.

2. The time-space modulation capability of the electromagnetic material was verified in the C-band. The designed electromagnetic material is conducive to the high integration of multiple electromagnetic functions and significantly reduces the number of apertures on the platform. Its strong ability to arbitrarily modulate amplitude and phase makes it highly potential for use in stealth communication systems, radar systems, and compact aerospace equipment.