The six-port reflectometer and its complete calibration by four standard terminations

An alternative nonlinear method to calibrate the six-port reflectometer is developed. Using this method, four standards and an iterative procedure are needed to calibrate the reflectometer. Experimental results show that this method converges very rapidly, provides a good accuracy in calibration parameters and at the same time avoids degenerate solutions which produce unwanted singularities in the measurement.