BLE PCB antenna design

[peit]

I am a beginner in BLE systems.
I am designing a board with a Nordic chip, and I have difficulties in designing an antenna...
Can you look at my technical solution and correct me if I have calculated incorrectly?

[Kenneth]

Hi,

Try to read this:  General PCB design guidelines for nRF52 series  

Also check out: 
https://docs.nordicsemi.com/bundle/WP_PDF/resource/nwp_008.pdf 
https://devzone.nordicsemi.com/f/nordic-q-a/69005/2-4-ghz-antenna-design-for-nrf52832 

Kenneth

[peit]

This confused me even more...
The antenna components should be the same (based on their diagrams on nRF52840, nRF52820 or nRF52833), but on the diagram from the nRF52840 dongle there is not a straight antenna but a meander and there are other components

[Kenneth]

To find the final values for the PI-network one need to follow:
https://docs.nordicsemi.com/bundle/nwp_017/resource/nwp_017.pdf 

Kenneth