[SI-LIST] Re: S-parameter Bisection
- From: wolfgang.maichen@xxxxxxxxxxxx
- To: "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
- Date: Tue, 10 Nov 2009 14:48:05 -0800
You'll need to convert the S-parameter matrix into an ABCD-Matrix first.
Then you can split up the latter (take the "square root") and convert the
result back into S-parameters. The reason is that S-parameters implicitly
assume that all your ports are terminated to 50 Ohms (or whatever your
reference impedance is), and that is not necessarily true for the center
of your cable where you want to do the virtual split.
Wolfgang
"Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
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11/10/2009 10:04 AM
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[SI-LIST] S-parameter Bisection
Is it possible to split a passive S-parameter matrix into two equal
sections?
For example; given s-parameters for a transmission line of a 10" length
can the matrix be split into two 5" lengths. Assume that the passive
s-parameter obeys reciprocity.
The reason I'm asking is that I have a test fixture on each end of my
measurement that I'm trying to de-embed. The insertion loss can be
subtracted very easily, but the return loss and other parameters have a
great deal of error dealing with de-embedding from one side of the DUT
only. I'm hoping to break the fixture into two equal parts without
having a direct point of measurement to do so otherwise.
Merrick M. Moeller
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