Two-port calibration of test fixtures with OSL method

The open-short-load (OSL) method is very simple and widely used for one-port test fixture calibration. In this paper, this method is extended to the two-port calibration of test fixtures for the first time. The problem of phase uncertainty arising in this application has been solved. The comparison between our results and those obtained with the short-open-load-thru (SOLT) method shows that the established method is accurate enough for practical applications.