Improved implementation of four-standard procedure for calibrating six-port reflectometers

The present paper describes an improved version of a four-standard calibration procedure for six-port reflectometers that utilizes simple iteration computations instead of the other more cumbersome optimization techniques attempted previously. The four standards required are a matched load (with a return loss not more than -40 dB) and three highly reflecting terminations (each with a return loss not less than -2 dB)