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how do you model noise figure contribution of a 3 port device

Question asked by apchar001 on Jun 27, 2014
Latest reply on Jun 30, 2014 by dan.peabody
I've got a coupler in my receiver chain that I want to model with the 3 port S parameters that I've measured but I need to include the effect of the coupler on the noise figure of tthe system. If it were a 2 port passive loss  I'd just use |s21| for the noise figure and append it to the end of the s2p file like you're supposed to. But you cant include noise data in s3p files. So how do I model the noise of a passive lossy 3 port device like a coupler?