I am using MCK swissto12 characterisation kit and after performing calibration with VNA, but when it comes to connect MCK with the waveguide, it appears that results are flawed as S21 does not change either by connecting MCK together (as thru) as even by giving any gap? Any views.
What frequency band is your kit, and what frequencies are you measuring over?
Have you put the waveguide adaptors on the right way round - it looks as if they can be fitted 90 deg rotated in which case no power can get through the join.
In the "how it works" video on the https://mck.swissto12.ch/ page it looks to me as if the first adaptor has been fitted the wrong way round - that is what marketing people do when they don't get supervised properly! You will also notice that the waveguide opening at one end is 90 deg rotated from the one at the other - that is why the connector is on the wrong way. I expect that would stop it from working too! (unless the object you put in the middle rotates the polarization 90 deg) Also the connectors have left hand threads - maybe they do?
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