Six-Port Calibration Utilizing Matched Load and Unknown Calibration Loads

A six-port calibration technique utilizing matched load and unknown calibration loads having arbitrary magnitude and phase is proposed. A detailed description of the proposed calibration procedure is given and illustrated with the aid of exemplary simulated values. Its performance has been validated with the use of a six-port measurement system operating over 2.5-3.5-GHz bandwidth. This system has been calibrated using the proposed calibration and a reference procedure which utilizes the same calibration loads as known values. Furthermore, five reflection coefficients of broadband one-port devices have been measured. The results obtained for both cases are in good agreement in terms of magnitude and phase. Moreover, they are very close to the values measured using a commercial vector network analyzer.