[SI-LIST] Re: S-parameter Bisection
- From: Ihsan Erdin <erdinih@xxxxxxxxx>
- To: "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
- Date: Wed, 11 Nov 2009 07:34:51 -0500
Merrick,
The solution is simple and available in any undergrad microwave
textbook. The S-parameters should be first converted into T-parameters
and then cascaded to represent the original structure. However, the
conversion involves matrix inversions and any noise in the original
parameters may be amplified and corrupt the converted parameters. For
simulation results, this is seldom a problem but measurement results
may need to be post-processed before any conversion.
I especially emphasized the transmission coefficients (T-parameters)
instead of notorious ABCD parameters because T-parameters are
expressed in terms of reflected and transmitted power at the ports
just like s-parameters while the ABCD parameters are in terms of
voltage and current.
Ihsan
On Tue, Nov 10, 2009 at 1:04 PM, Moeller, Merrick
<mmoeller@xxxxxxxxxxxxxxx> wrote:
>
> 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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