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Why the short load not on the short circuit point of the Smith Chart?

Question asked by jiyuan on Oct 19, 2013
Latest reply on Oct 28, 2013 by jiyuan
After SOLT calibration, I connect the short load to one port. The impedance point is not on the short circuit point of the S11 Smith Chart, but rotates by some degrees. So does the open load. But their phase difference is 180 deg. Why?  

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