Choice of calibration equations in calibrating microwave test fixtures

The error theory of linear equation system has been applied to the calibration procedure of microwave network analyser in this article. A new explanation for the choice of the linear calibration equations is proposed and a general principle for choosing calibration equations is presented. The method can also be used to predict the occurrence of the problem of frequency limitation at some periodic frequencies. This principle is employed to the thru-short-delay (TSD) method and the solution using the chosen equations gives the most accurate results. A good agreement between the theory and the experiment has been obtained.

National Natural Science Foundation of China 60510173 605360106053600660606019National Basic Research Program of China 2006CB604902 2006CB302806 2006DFA11880 The work is supported in part by the National Natural Science Foundation of China under 60510173, 60536010, 60536006, and 60606019, and in part by the National Basic Research Program of China under 2006CB604902, 2006CB302806, and 2006DFA11880.