# electric length - RF Cafe Forums

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 Post subject: electric length Posted: Tue May 20, 2008 1:34 pm
 Lieutenant

Joined: Tue May 20, 2008 1:31 pm
Posts: 1
hi, someone can help me?
I need found one way to find the electric length using a S parameters. I need need equation to implement in matlab.
thanks

 Post subject: Re: electric length Posted: Thu Jul 09, 2009 12:47 pm
 Colonel

Joined: Wed Apr 08, 2009 11:07 am
Posts: 34
 electrical length of what? If it is well matched and well behaved, like a transmission line, you can figure out the group delay passing thru it by looking at angle[s21].Td=delta phase/delta frequencyang[s21] at 1 ghz = -20 degrees angl[s21] at 1.1 ghz = -25 degreesTd=(25-20)/((360 deg/cycle)*100MHz) = 138 pS electrical length _________________RichMaguffin Microwave Consulting www.MaguffinMicrowave.com

Posted  11/12/2012