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I am measuring sdd21 values around -40dB.
Very often I have problem with the cables.
suppose I have S11 S22 S33 S44 at -10dB which is good can I be comfident that the SDD21 result is accurate?
I had lots of situation where I have reflections inside the VNA cables which where shown by the impulse responce at t<0 of the sdd11.
So is it critical ? or good return loss at all ports means good cross talk?
Thanks.
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