Which antenna type and layout is recommended having a free space of 32x26mm on PCB?

[d.s.]

Hi there,

I have an 70mm wide and 50mm high PCB with an free space of about 32x26mm on the right top corner. At the moment this area is free of any traces and polygons. The remaining area is filled with traces and ground polygons (one layer is just ground, nothing other).

Which antenna type, which arrangement for the nRF52832 and surrounding parts and which layout for the whole bluetooth part would you reccomend to get best possible range and and a non-directional characteristic (omnidirectional)? I plan to try some different layouts with different types of antenna (monopole, f-antenna, chip antenna, meander antenna, etc.) to evaluate which works best for our application.

Just for size comparison - I added a second screenshot where i placed the bluetooth parts anywhere and have drawn an antenna with the same size like on the developement board. Btw... grid is set to 1mm at the screenshots and the holes you can see at the left edge belong to an connector which is placed in the middle of the PCB.

I would be very glad if you can help me with my matter.
Thanks a lot in advance!

Best regards,
Dominik

[d.s.]

Thank's a lot for your advice ;)

I attached some screenshots of a layout similar to Nordic's dev.board.
Feedline is 45mil, clearance to ground is 8 mil. On an 1.6mm pcb this should result in 50 ohm impedance if I am right.
Is there anything what is wrong or what could be done better?

Thanks a lot in advance!

Best regards,
Dominik

[ketiljo]

This should work well. I assume the U-FL connector is going to be used instead of the antenna, with either the connector or R400 in place and not both on the same time.