Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	Precise Integrated and Reflectometer for CW and Pulsed Signals at 2.45 GHz [PDF]
AUTHORS	D. Fricke, V Pohl and A. Mühlbauer 1994 29 3 180-188
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Abstract A new vector voltmeter concept for microwave reflection measurements is presented. It allows precise online determination of the reflection coefficient for continuous-wave (CW) and pulsed signals in microwave heating facilities. All components-including the directional coupler-can be integrated on printed circuits. In the setup developed, the incident and reflected wave are separated with a hybrid coupler. Two following mixer stages convert the signals from 2.45 GHz to 455 kHz, where amplitude and phase detection are carried out with integrated circuits. After data transfer to a computer the accuracy is improved by means of an error model. Key Words: Microwaves, Reflectometer, Online measurement, Error model, Calibration.