ST25R95 detect ST25D tag

[Eyzeryong]

I use ST25R95 to detect the ST25D tag. I keep the tag on the antenna of the Reader all the time, and some situations have occurred.

Hi

Even if I place it precisely on it all the time, the tag may not be read probabilistically during detection. Is this normal? The antenna fails to read the tag about two or three times out of ten readings.

Please help me,thanks~

[Eyzeryong]

Hi,

Thanks for your answer,I modify the value of the capacitance,It doesn't happen such issue again

[Eyzeryong]

By referring to the specification sheet of my magnetic bead, when the frequency is at 13.56 MHz, its inductance is 0.35 μH. May I ask if my way of filling in is correct? I replaced C20 and C17 with 332,and then will appear in the correct Smith chart,

[Blake_Victor]

Hi,

Yes, you have filled with correct value. Please check with the Smith chart to ensure the values are correct. If you need to fine-tune the values, you can adjust them accordingly.

BR,

BV