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Why is the second "antenna matching network" not shown in the example?

siyar
Associate II

‎2025-05-09 10:58 AM - last edited on ‎2025-05-09 3:16 PM by

Hi, 

Im developing stm32wb55ceu6 RF application hardware. In the application note AN5290 it says that a second antenna matching network is needed after the LP filter . But i cant find anything else about this matching network.

siyar_0-1746813340748.png

Next page at the schematic example, this second antenna matching network is not implemented. can someone shed some light on the this topic, thanks in advance.

siyar_1-1746813431320.png

 

 

 

 

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STTwo-32
ST Employee

‎2025-05-09 3:12 PM

Hello @siyar 

For more data about that, I suggest you to have a look at this video. It should help you with good explanation.

Best Regards.

STTwo-32

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