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Common Port Impedance

Question asked by davem on Jan 4, 2012
Latest reply on Apr 24, 2012 by wrivas
I have a simulation using Momentum GX in Genesys 2010.05 SP1 with three common ports.  As expected, these three ports are simulated as a single port by Momentum.  What I would like to be able to do is look at the impedance of only port 1, while ensuring that the metalized regions connected to ports 2 and 3 are also excited with the same potential and phase as port 1. 

Firstly, is a common port the best way to do this, or is there another port that anyone recommends.

Secondly, regarding the S parameters that the simulation returns, specifically the ZIN1 that the data file computes.  Are the S parameters only 'looking' into port 1, or are they as if ports 1, 2 and 3 are all connected together and then looking into that one port?

Thank you in advance for your assistance.