Improvement of six-port precision using linear space concept

A method using the linear space concept to improve six-port precision is presented. The method uses the constrained equation to describe the true power in six-port measurement systems under the assumption that system constants calibrated are precise. The theoretical analysis, geometric interpretation and computer simulation all prove the method to be effective as long as the second-order derivate of the constrained equation is not large. Experimental results for a coaxial six-port measurement system agree with the simulated results