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Embedding - De-embedding 4 ports

Question asked by ldalep on Jun 25, 2007
I would like a reference on the technique for Embedding - De-embedding.  I understand the concept of taking S-parameters and making them into an ABCD matrix for 2 ports then chaining, making inverses, and reconverting them.  I also had read that there is some type of matrix extension to this that allows N x N ports (Kind of a cluster of two ports).  Is this the technique that is used for > 2 ports and if so is there more of a reference for this that I can read?  :?: