Technical Information of NFC Coil of ANT7-T-25DV64KC

[STSD20]

Hello everyone,

As a students at a company do I try to build a tool or method to evaluate some parameters of NFC coils (Q and L). I have been given some NFC tags to proof the correct functionality later. One of those tags is the "ANT7-T-ST25DV04K" with a 14 mm x 14 mm, 13.56 MHz dual layer etched antenna.

My problem is, I could not find any values for the quality factor (Q-factor) and the inductance L for this NFC coil.

So, I would like to ask if anyone knows the Q-factor and/or the inductance L of this coil.

Otherwise, if you know these parameters of an other NFC tag, it would help, too.

Kind regards,

STSD20

PS. Of course I have already looked in the product datasheet.

[Alan BST]

Hello :)

Sorry for the late answer, 

please see below, the VNA measurement of the ANT7-T-ST25DV04K (the chip has been unsoldered to isolate only the antenna)

You have on the capture, the inductance value and resistor value of the Antenna at 13.56 MHz you can deduct by calculation the quality factor.

Thank you

Alan