A computer simulation analysis of the uncertainties in complex reflection coefficient measurements of a six-port reflectometer is given in this paper. Because the only error source for a calibrated six-port reflectometer is the microwave power measurement error

the present analysis tries to find the relationship between network parameters of six-ports and the related measurement error based on a given power measurement error level.The optimum six-port network parameters are then found and the maximum tolerances of network parameters to keep acceptable measurement accuracy are obtained.Furthermore

amulti-octave microwave circuit with the optimum network parameters is reported. This circuit is composed of ordinary quadrature directional couplers and 3 dB in-phase power dividers

designed by a computer aided design procedure

and realized by ordinary microwave integrated circuit technology in the laboratory.