When measuring the inductance and resistance of a rectangular antenna for PN53x using a VNA like miniVNA
at what frequency should the parameters be measured ?
A) 1 MHz
B) 13.56 MHz.
AN11535 the document says measure it at 1 MHz.
AN1445 says measure it at 1 MHz.
Slide 21 of this presentation says -
If I look at the NFC Antenna tuning video on NXP site the parameters measured are at 13.56 MHz.
I would like to know why the discrepancy ?? and what is the correct method.