PCB Antenna for nRF52840

[Alperen Akk]

Hello,

I am designing a custom board for nRF52840. I want to use the same antenna that is used in nRF52840 Dongle.

1. I might be using a different board thickness and for that reason, I might need to tweak the antenna. Is there are a tool that I can generate a geometry for the antenna shape?
2. I also need the dielectric constant of the FR4 material in the nRF dongle. I might also need to change the dielectric constant depending on what manufacturer has in stock.

How should I make these changes? Is there guide or a tool that lets me calculate based on the thickness and dielectric constant of the FR4 material?

Thanks!

[ketiljo]

1. Board thickness doesn't matter much for the antenna as it's on outside of the PCB and not dependent on the other side ground plane.

2. Er is not very important here. You need to tune the antenna on your design in any case.