The document shows that the target antenna impedance to get a maximum field strength and power transfer should be close to 20Ω. However, more current flows to the antnena when antenna impedance is lower than 20Ω. Doesn't this case get a maximum field strangth and power transfer?
Hi,
You are correct. Nevertheless, please remember that there is a limit on ITVDD, so the recommended antenna impedance should be around 20 Ω.
Regards,
Ivan.