About PN5180's impedance,what is correct?

[wujiaqiang]

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?

[ND2]

Hi Wingros,

So the antenna tuning in this case should be done to match with 20Ohm or 50Ohm for maximum reading distance (not working on a battery).

Please suggest.

Neel.

[ND2]

@Wingros

Would be great to get a response here.

Neel.

[weidong_sun]

Hello Wu,

    20OHM impedance is between TX line & antenna;

    50OHM impedance is between signal line & GND.

Understand my explanation?

Best Regards,

Weidong