Why do we measure the NFC anetnna at 1MHz not 13.56MHz?

[atsen.1]

The application note "AN5276" suggest we measure the antenna parameter at 1MHz.

It confuse me that why we could not directly measure it at 13.56MHz.

Regards,

Albert Tseng

[Travis Palmer · Accepted solution]

Hello Tseng,

The DC resistance is beeing measured at the lowest possible frequency of the VNA.

For most VNAs the lowest possible frequncy is 1MHz.

BR Travis