Question about 3-port SAW filter S parameter measurement...

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RF_beginner

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I am a RF fresh man.
Now I'd like to measure a 3-port banlanced input and unbanlanced output SAW FILTER S parameter (for example: SAWTEK 856113) but I only have a two port Network Analyser,how should I do to get the S parameter? the third port's match is the key ?
 

1.measure the SAW use VNA 3 times ,and get 3 ports s parameters, convert it into differential-mode s paramenters with matlab
2.get a balun and match it to the balanced port of SAW
 

use a matched load to connect to one of the port
then use a NA to measure the two port S-parameters. Repeat this steps 2 more times.
You can get 3ports S-parameters.
 

Re: Question about 3-port SAW filter S parameter measurement

**broken link removed**
 

Use 3 ports VNA, you can get the differential-mode s paramenters directly
 

Re: Question about 3-port SAW filter S parameter measurement

You have to use matched load. I think the measurement should be pretty similar with 3 ports.
 

What is difference between the single ended and differential S paramenter ?
 

you can find differential-mode and common-mode directly in the differential s parameter
 

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