Explicit solution of calibration equations for a dual 6-port network analyser

Application of the 6-port reflectometer for the measurement of complex reflection coefficient, without the direct measurement of phase, is extended to a dual 6-port system for the characterisation of 2-port networks in terms of S-parameters. The system is self-calibrating and no additional standards are needed if the two reflectometers are first calibrated individually by measurements referred to calculated standards of impedance.