Antenna selection about nrf52840-mdk HOT 4 CLOSED

Hi there,
A rework must be performed before the U.FL connector can be used; this involves swapping the position of a 3.3nH chip inductor. The modified board would appear as follows.

• Here is for the external antenna:
  

• And here is for the chip antenna:
  

nRF-SDK 15.2 support is working in process. I will update the examples later.

Best,
Zelin

from nrf52840-mdk.

Oops, that kind of "selectable".
Thank you for your answer.
Kind regards,
Tobi

from nrf52840-mdk.

@caizelin sorry to bring up an old thread, but can you confirm the 1 pF capacitor does not need to be moved? Looking at the schematic, the chip antenna uses L4 (3.3nH) and C38 (1pF) as a matching network for 50 ohm chip antenna. The instructions here only say to move L4 (3.3 nH). Can you confirm C38 (1pF) does not need to be moved the empty C46 footprint? I figured we would need to move both to match 50 ohm impedance.

Thanks!

from nrf52840-mdk.

I've manage to make the external antenna working by only moving the L4. That wasn't a piece of cake with this size of component (0402) but I did it !

from nrf52840-mdk.