I fully agree with spminn and molidong.
This question is actually related to TRL calibration technique described in the famous book of David Pozar "Microwave Engineering". It is written (in terms of ABCD matrix):
[Measurement]=[Error][DUT]inv[Error]. I think, this is incorrect.
Let's say
[Error]=[A,B;C,D], then
[Measurement]=[A,B;C,D][DUT][D,B;C,A]
Related to the same topic, given equations 4.74a, 4.74b, 4.75, 4.76a, and 4.76b, Pozar derived the equations 4.77a, 4.77b and 4.78 (please see the attachment).
I believe 4.77a, 4.77b and 4.78 are all incorrect.
Could someone try to solve this set of equations?
regards,
wlcsp