Ultra wide-band four-port reflectometer using only two quadratic detectors

A new wideband (1-4 GHz) four-port reflectometer is proposed as an alternative to the well-known six-port reflectometer. The prototype circuit is fabricated to validate this new concept by means of a hybrid integrated-circuit technology. The topology that has been conceived is also suitable for monolithic-microwave integrated-circuit fabrication. Associated to this system, a new simple explicit calibration solution using a matched load and positions of a sliding-short is developed to extend the frequency band of use up to 10 GHz.