[SI-LIST] Re: How to construct S2P from impulse response?

  • From: "Istvan Novak" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "istvan.novak" for DMARC)
  • To: capn.freako@xxxxxxxxx
  • Date: Wed, 2 Jun 2021 08:23:51 -0400

Hi David,

If we follow the definitions, you would also need the impulse responses 
(or its integral, the TDR response) of the two ports, while the other 
port is properly terminated.

Best regards,

Istvan



On 6/1/2021 8:44 PM, David Banas wrote:

Hi Istvan,
Thanks so much for taking the time to respond!

Do you have an opinion on what extra information I would need from the person 
providing me the channel impulse response, in order to make a reasonable 
attempt at converting it into a 2-port Touchstone file?

Thanks,
-db


On Jun 1, 2021, at 2:49 PM, Istvan Novak <istvan.novak@xxxxxxxxxxx> wrote:

Hi David,

I am not sure you can do it unless you have some extreme situiation.  From 
the complex fft of h(t) you get one complex number per frequency, but you 
have three unknown complex values (S11, S22, S21ñ2 if the DUT is reciprocal).

Best regards,

Istvan

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