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Unknown Thru calibration on N5227A

Question asked by gah0007 on Nov 24, 2015
Latest reply on Dec 21, 2015 by Dr_joel
I am attempting an unknown thru calibration on a PNA N5227A with SMA connectors.  I am wondering what the limitations are on this calibration. I have a unknown thru that has not-so good match (<- 10dB) from 10 MHz to 16 GHz. My loss is about 23 dB at 16 GHz. Whenever i do the calibration, i get an unrealistic post-calibration measurement (i.e. S11 < -30 dB) and S21 essentially open (-40dB) across this particular frequency range. I am wondering if i have to use a better matched thru and/or less lossy thru. The documentation stipulates that as long as you dont have 40 dB loss including the cables this method should work. I am dumbfounded as to what could be going on. I can post some of the plots if this helps answer the question.
thank You,