NFC Antenna Tuning?

[SRall]

I have a product which uses the nRF52840 SoC that will also have NFC functionality. The housing of the PCB is sort of forcing a custom design for the NFC Antenna. 

We need an antenna in a coil shape (rather than the square loop antenna the 840 DK comes with). Are there any resources or direction when interfacing a custom NFC antenna design on the 840 DK? Is this something I can utilize the antenna tuning service for?

Our current approach is to try and size up a copper wire loop with a calculated number of turns to match the tuning circuity on board the 840 DK to get the 13.56MHz field. Would this be the right approach?

Thanks, 

Sam

[Marjeris Romero]

Hi Sam,

The NFC forum has quite a few reference designs you can use for your NFC antenna.

Usually the shape of the antenna plays a minor part, as long as the center opening of the antenna is about the same size of the antenna on the reader. 

And yes, you can use the antenna tuning service when you are finished with a prototype. Just make a private ticket here in Devzone and attached both your schematic and layout design for review so we can proceed with tuning.

We also have a whitepaper about NFC antenna tuning which is good to read here: https://infocenter.nordicsemi.com/topic/nwp_026/WP/nwp_026/nWP_026_intro.html

Best regards,

Marjeris