FreeLists / si-list / [SI-LIST] Question about S-parameter and ABCD matrix

["Saoer Sinaga" <saoer.sinaga@xxxxxxxxx>]

Hi all,
I am not really sure if this is a relevant question for this forum.
Suppose I have a two-port non-symmetric passive network whose S-par is
Sx=[S11,S12;S21,S22]=[S11,S12;S12,S22].
Let's say the ABCD matrix of this network is Ax=[A,B;C,D].

If I rotate the device 180 degree, meaning port2 becomes port1 and vice
versa, then the S-parameter would be Sy=[S22,S12;S12,S11]. Hence, the ABCD
matrix would then be Ay=[D,B;C,A].

Am I missing something here?
In the "Microwave Engineering" by David M. Pozar book, it is written that
Ay=inverse[Ax].

regards,
Saoer
NXP Semiconductors


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