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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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miguel.jls

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

biff44

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 frequency

ang[s21] at 1 ghz = -20 degrees
angl[s21] at 1.1 ghz = -25 degrees

Td=(25-20)/((360 deg/cycle)*100MHz) = 138 pS electrical length

_________________
Rich
Maguffin Microwave Consulting
www.MaguffinMicrowave.com

Posted 11/12/2012

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