Hi,
I want to make a custom dimension - 20mm x 320 mm - external antenna coil for PN5180 NFC Module/Chip.
To do this I need to design an antenna that has inductance of 0.8-3 microhenry, and then a matching circuit to match with the chip/s 20 ohm load impedance at 13.56 MHz.
I only have an oscilloscope and a signal generator.
My questions are,
1. How do I measure inductance of the following antennas
2. How do I measure impedance on the pn5180 module, and when I do, the result should be 20 ohm, right?
3. Can I measure inductance of the antenna on the pcb? I should disconnect the matching circucit to do it, right?
4. How do I disconnect the pcb antenna from the module and connect to it either of two coils from photos above.
