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.
(https://www.nxp.com/video/nfc-antenna-design-2-antenna-matching:ANTENNA-MATCHING-VIDEO)
I would like to know why the discrepancy ?? and what is the correct method.
For the tuning we need L, R and C at 13.56MHz, so please follow the steps in the video of https://www.nxp.com/video/nfc-antenna-design-2-antenna-matching:ANTENNA-MATCHING-VIDEO, which is the simplest and correct way.
Hope that makes sense,
Have a great day,
Kan
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