I am using CLRC663 NFC reader, I have designed the matching circuit of my Antenna with 23 Ohm target impedance, however the operating distance is not as required, it is 2 cm using NTAG216 and 0.5 cm using the MIFARE DESFIRE EV1 Tag.
The diameter of my round antenna is 2cm
- I would like to ask why the operating distance different when using the MIFARE card, and it is better with NTAG.
By any chance, have you checked the different webinars available in the page regarding the antenna design Online Training|NXP ? There are six of them which might give you the best guide regarding the antenna design recommendations.