Is there a known RF immunity problem at 2.3GHz?

[nikolrobottesla]

We recently did pre-compliance RF radiated immunity testing at a certified lab. The EUT was nRF52832 on a battery powered post card sized circuit board with some sensors. We lost bluetooth connection at 2.3GHz+-.01GHz with a field strength of 3V/m. The nRF did not reset. Is there a known RF immunity problem at 2.3GHz with the radio?

It seems odd that the interference was at 2.3GHz and not in the radio band.

Test details: RF Radiated Immunity 80MHz-6GHz. Referenced EN 301-489-1 EN 61000-6-2 -10V/M (80Mhz-1GHz) -3V/M (1Ghz-6Ghz) (2 second dwell) Interruption in EUT communication to host at 2.3GHz.

J3 was not populated. )

[Turbo J]

Have a look at the antenna and its feed.

[ovrebekk]

Hi

Did you follow the reference layout when designing the RF circuitry?

If you attach the layout we can have a look at it, and see if it looks fine.

Best regards
Torbjørn

[Andreas]

Hi

There is not a known RF immunity problem, I suspect that the reason your board is failing the test is the layout. The matching network is not laid out as in our reference design. The impedance matching is therefore most likely off.

Also the antenna does not seem to be tuned, which can make problems worse. I still would not mind having a look at the rest of the board also - feel free to make a case in Mypage if do not want to share the rest of your board publicly.

Best regards, Andreas