NFC antenna - total resistance of antenna copper traces

[JPehl.1]

According to this values on eDesign Suite:

What would be the resistance of the entire trace, from one edge to other, in ohms? NXP calculator gave result as 2,05 ohms on their tool. But I am here to ask what would be the actual resistance of the antenna above? I need to know the resistance to calculate the EMI filter and coupling components.

Can I rely on that 2,05 ohms value?

Regards.

[JPehl.1]

I have used some online copper trace resistance calculators and had result of around 1.6~1.65 ohms.

parameters are:

• thickness = 1/2oz = 18um
• width = 0.25mm
• length = 418mm

I got that 1.6ohm result on 5 calculators, so it should be correct. And I will use that value on the ST25R95 filter and matching calculation.

I just need to know the correct value to input it on the spreadsheet.

Current layout of NFC is on right:

[Henry Crane · Accepted solution]

Hello,

a simulation of your antenna leads to 2 ohms for the real part of impedance at 13.56MHz.

By experience, this result shall be multiplied by 1.5 or 2 to fit with measurements done using network analyzer or impedance analyzer.

best regards,

Feel free to contact us for more information,

Henry Crane NFC/RFID support.