Estimation of True Power Ratios in Six-Port Network Analyzers Using Diode Detectors

A model for detector nonlinearity is included in the determination of six-port parameters without using additional standards. A computer simulation was performed assuming that the true power into each six-port detector is related to the power observed by the detector. Simultaneous estimation of the six-port and detector parameters is accomplished through a nonlinear least squares algorithm. Results of the simulation compare Γ computed from corrected power readings and Γ calculated from observed power readings.