Hello,I am using the ST25R3913, following the application note and matching tool to define LC components for EMC filter and matching circuit. Now the function test is quite good, but I have a high pulse at 3rd harmonics (40.8MHz), do you have similar...

The EMC cutoff frequency of ST25R3911B is defined as 11.75MHz with L= 270 nH, C= 680p. However, the antenna resonates at 13.56MHz. I can understand if the cutoff frequency is defined between 14 -18 MHz to suppress the 2rd harmonic mode. Could you gi...