For a project I'm using the CLCR663 plus IC to read out Desfire EV2 cards.
As it's a battery powered application we are using the low power card detection feature of the CLRC663.
Because of this LPCD we want our antenna design to have the highest possible Q-factor to have the best detection range in LPCD mode.
We tested various design options with Q-factor up to 100 and still have good readout results and detection range. In this application note (AN11019) however it is suggested that for a bit-rate of 106 kbit/s the Q-factor should be 25.
As this is an application note and not a specification I'm curious to find out if you have suggestions/spec for the maximum Q-factor in this application. I could not find a spec for this in the datasheet.
Please allow us some comments on your statements:
Hope this information helps you to have a better performance of your system.