Question: How to measure matching?

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brian39

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How to measure matching?

There is a matching circuit between SAW filter and LNA on a PCB. when

needs measuring the matching of this circuit . How to measure ? It works

GSM900 band , i think only power to measure after SAW filter and before

LNA with Spectrum Analyzer, is right? Pls give me a correct way.
 

Hi brian39,

To measure the correct matching, you have to use a network analyzer connected after your SAW filter and to measure the S11 parameter.
This gives you the return loss (reflected power) which should be as small as possible (better than -10dB is often OK). The phase information can be used to optimize the matching network.
If you don't use the phase info and you don't have a network analyzer you can also measure the return loss with a directional coupler, a frequency generator and a spectrum analyzer or powermeter.

Bye
 

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