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Converting S-Parameters to Complex Impedance - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: Converting S-Parameters to Complex Impedance
Posted: Wed Sep 15, 2010 4:46 pm 
 
Lieutenant

Joined: Wed Jun 23, 2004 8:44 am
Posts: 1
Hi people. I am looking for the equations for converting s-parameter data to complex impedances. Does anyone know where to find that?


 
   
 
 Post subject: Re: Converting S-Parameters to Complex Impedance
Posted: Sat Oct 09, 2010 8:29 pm 
 
Colonel

Joined: Sat Nov 08, 2008 11:35 pm
Posts: 30
Location: Ramona, CA
I believe what you are looking for

Zin=Zo((1+S11)/(1-S11))

Zin being the complex impedance and Zo the measurement reference impedance (50 Ohm usually)
S11 being the complex voltage reflection coefficient.

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