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X-nucleo nfc03a1 antenna measurement

Andy b1
Associate

Hi,

 

I'm trying to measure X-Nucleo-nfc03a1 with VNA:

 

Andyb1_0-1770121215450.png

i got completely different values for C11 C22 and C2 as is on nucleo board. I understood something wrong?

 

and when I remove Resistors 330ohm, inductor and 4 100pF capacitors 

I got like:

Andyb1_1-1770121757457.png

 

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