Abstract
An automatic method for self-calibrating six-port reflectometers is reported in this paper. It is based on the use of an active impedance synthesis system. This self-calibration method allows a completely autonomous operation, reduces measurement errors caused by the frequent connecting and disconnecting of calibration standards and is suitable for low and high frequencies where sliding shorts are difficult to manufacture. Also, it simplifies operation of six-port reflectometers for non-specialized users. The impedance synthesis relies on all IQ vector modulator, and the entire system is computer controlled. The setup is very flexible and can be used in many applications, one of which is described, namely an automated active load-pull measurement system.