Antenna design for M24SR

[fab04]

Hi,

I got a question about the design of the antenna for NFC.

On my PCB, I'm copying the antenna that there is on the ANT7-T-M24SR. But the difference is that my PCB is 1.6mm of thickness (instead of 0.8mm of the dev board).

Moreover, I've read (I think it was on that forum) that the value of L decrease of 0.4µH with a PCB of 1.6mm of thickness compared with a PCB of 0.8mm of thickness.

So, how can I be sure that my antenna is well designed ?

For now, I've added a capacitor in parallel of AC0/AC1 to adjust Ctuning if needed.

I've found some information on edesign to design one layer antenna but nothing about two layers antenna. Where can I find some documentation about that ?

Thank you in advance;

Fabrice

[Berenice BENVEGUDA · Accepted solution]

Hello Fabrice,

First of all, thanks for you interest in ST NFC products !

Then, is the following document useful for you ?:

https://www.st.com/resource/en/application_note/an5605-design-of-a-1356-mhz-doublelayer-antenna-stmicroelectronics.pdf

Best Regards,

BB