研究目的
To measure the reflection coefficient of a terminal load at medium RF power (about 150 W) from 1 GHz to 2.5 GHz using a four-port reflectometer system.
研究成果
The study demonstrates the feasibility of using a four-port reflectometer for measuring the reflection coefficient of terminal loads at medium RF power. The method shows promise for application at higher power levels, with future research directed towards evaluating measurement uncertainty and extending the methodology to six-port reflectometers.
研究不足
The accuracy in measurement of small reflection coefficients is mainly limited by the directivity of the couplers. Higher directivities are required for smaller uncertainties.
1：Experimental Design and Method Selection:
The study employs a four-port reflectometer system to measure the reflection coefficient of a terminal load at medium RF power. The methodology involves comparing the scattering parameters of the reflectometer at low and medium power levels to validate its applicability.
2：Sample Selection and Data Sources:
The terminal load's reflection coefficient is measured under medium RF power conditions (about 150 W) across a frequency range of 1 GHz to 2.5 GHz.
3：5 GHz.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Four-port reflectometer, directional couplers, power sensors, and a vector network analyzer (VNA) for low power measurements.
4：Experimental Procedures and Operational Workflow:
The reflectometer's scattering parameters are measured at low power and then validated for medium power application through external heating experiments. The reflection coefficient is calculated based on the ratio of sidearm outputs.
5：Data Analysis Methods:
The magnitude of the reflection coefficient is derived from the ratio of the sidearm outputs, with considerations for the directivity of the couplers affecting measurement accuracy.
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