Nordic open source NFC antenna modification

[Valentinas]

Hi,

We are working on Nordic NFC antenna modification - it has to be lengthened by 15 mm to fit in our case.

1. Question - is the green marked part curved just to gain some length? In that case i guess i can make it straight because i have increased the red marked part by 15 mm.

2. How important is length in this design? Will it work just fine if i increase the length by said 15 mm?

Thank you!

[Andreas]

Hi,

 

Both should work fine. You might see slightly different tuning capacitance needed, so make sure you tune the actual antenna you make, not the one that comes with the DK.

 

Best regards,

Andreas

[Valentinas]

Hi,

Is it correct to say that copper is crossing each other just to gain some length? In my case I can make it straight then to keep similar length even after extending.

[Andreas]

Hi,

 

Yes, it does not serve a purpose to get the antenna to work, if that is what you mean. The NFC antenna is just a coil, communicating with the reader though mutual inductance and varying the load resistance internal to the nRF52, and thus the current flowing through the reader loop. The crossing I suspect might be to create some twisted pair mechanic, or similar, but it should work just fine if you keep it straight also.

 

Best regards,

Andreas