Could nRF51822 use two Antennas?

[Angela]

HI,

when I used nRF51822 for 2.4G transfer ,I found that RX can't receive data in some direction .Can TX use two antennas and matching networks to work alternately in order that RX can receive data all around ?

Thanks!

Best regards,

[Janek Mann]

Hi Angela,

in theory, this could be done using an RF switch (like ADG918).

In most cases, switching after the balun would be preferable as only one line needs to be switched rather than two.

Obviously the S110 soft device and other example code from Nordic don't support antenna diversity out of the box. It is conceivable that for BLE it would work to switch the antenna on each ble_on_radio_active_evt (so every second connection period would occur with the "better" antenna).

Implementation would be tricky however and you would be well-advised to consider seeking advice from an experienced RF engineer to get the layout right.

[Sami]

Hi Angela, it is interesting for me that you had the same problem as I have now.Rx can't receive in some direction. can you let me know how you solve this problem?

Regards, Samira