NRF51422 differential antenna port impedance?

[Guillermo]

I am trying to use a differential antenna with the NRF51422 and I do not want to misunderstand the datasheet. It says that the optimum differential impedance at 2.4 GHz seen into the matching network from pin ANT1 and ANT2 is 15+85j Ohms so I understand the differential impedance of the port into the chip is 15-85j.

Could you please tell me if I am right?

Thank you in advance.

Guillermo

[FormerMember]

[Guillermo]

First of all, thank you for the reply, now it is clear. However, as I pointed in the question I would like to use a differential antenna (a dipole) instead of a 50 Ohm monopole and matching network. I have seen that you always use monopole antennas in your reference design so I wonder whether it is possible or good idea to use a dipole antenna.

[FormerMember]

Please take a look at the two following posts regarding dipole antennas: 1 and 2.