Small sized NFC antenna pattern?

[davman]

Hi,

Anyone around that has good experience designing nfc antennas? I'm in need of a pattern that is about 50% the size of the flex that comes with the nrf52 kit.

Doable?

[FormerMember]

The principle of NFC communication is that the active device (poller) induces a magnetic field that will induce a current in the passive device (listener). How efficient this transfer of energy is (how much current that is induced in the passive device) heavily depends on how similar the NFC antennas are. Two NFC antennas of similar shape, size, and number of turns will be a lot more efficient than two NFC antennas of different shape, size and number of turns. Therefore, it is important that the NFC antenna on your device is similar to the normal type of NFC antennas for your application.