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NRF51422 differential antenna port impedance?

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

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