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About PN5180's  impedance,what is correct?

Question asked by wu jiaqiang on Nov 8, 2016
Latest reply on Oct 16, 2018 by Neel Shah

The Fig 20 shows the driver current ITVDD versus the antenna impedance. The target impedance to get a maximum field strength and power transfer should be close to 20Ω.(PN5180 Antenna design guide.pdf)

but the other part is 50Ohm,what is correct?