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SOLT with different s11 and s22 for 2 port cal

Question asked by Lucux on Jul 11, 2013
Latest reply on Jul 15, 2013 by kenwong

we made a SOLT calibation kit for a customised interface. however, when doing two ports calibration we have found s11 and s22 are different. Is there any reason why this happens? but when doing 1 port calibation seperately, we can get the same s11 and s22. the problem happens only we do 2 port calibration. any possible way to have this solved?