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ST25R3911B - Calculating coil inductance

Question asked by Gualbert Maas on Apr 10, 2018
Latest reply on Apr 13, 2018 by Travis Palmer

Hi all, I am looking at the ST25R3911B-DISCO board and I want to see what the inductance is of the coil they have on the eval kit. I can't seem to find the formulas for this specific application where you have 2 coils shorted to GND as it is done on the DISCO board.

 

Also, I would like to understand why ST, on the DISCO board, have 2 coils shorted to GND rather than just 1 coil connected between RFO1 and RFO2?

 

On the eval kit the distance from coil to circuitry is approximately 10mm but what would the general safe distance be from the coil. I know "more is better" but I am a bit crammed for space in my design.

 

Any insights to the above is greatly appreciated

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