Measurement of Load–Reflection Coefficient Using High-Power, High-Frequency RF Source

This paper proposes a real-time measurement system for reflection coefficients, utilizing a high-power, high-frequency RF source. The system is configured using a 2.45 GHz, 300 W GaN SSPA, two WR-284 directional couplers, two WR-284 circulators, an S-band mixer, and an analog-to-digital converter (ADC). By leveraging the one-port calibration of a commercial vector network analyzer (VNA) for error compensation, the system demonstrates the real-time acquisition of accurate reflection coefficients by using a MATLAB-integrated ADC program, without the need for expensive equipment. The accuracy of the system is validated by comparing the MATLAB-calculated results with the VNA measurements, showing consistency within the established error margin.