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Odd mode and even mode impedances

Question asked by ASWIN on Mar 16, 2006
Latest reply on Dec 19, 2006 by ALEPEREZ
I am simulating a coupled line in momentum and I dont know how to compute the even mode and odd mode impedances.
The structure consists of a simple pair of coupled lines.
For the even mode impedance computation, I set up the ports on each side as common mode ports with 50 ohms impedance and the association is the port below/above it.
I looked at the input impedance and the answer is far off from the required answer.
Same situation with odd mode using differential ports.
Please help me.  

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