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MIFARE DESFire Tuning Questions

Question asked by Wilmer Suarez on Nov 7, 2019

Hello,

 

Over the past few weeks I have been working on attempting to migrate from MIFARE Classic cards to DESFire EV2 cards. I have been having a lot of detection issues with the DESFire EV2 cards.

When going through the initial anti-collision process for both cards, the Classic cards seem to have a much better range than the EV2 cards. EV2 cards are sometimes never detected, especially when the center of the card is placed near the antenna. Is there a reason for this?

 

Using a spectrum analyzer, the resonance of the DESFire Card seem to be off tuned from 13.56 MHz (16-17 MHz). Is there a way to change the tuning of the DESFire cards? Or purchasing ones that are tuned properly?

 

I am considering trying the DESFire Light cards instead, as I only need a single application; but I am afraid they will have he same issue.

 

Thank you

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