Impedance matching in Near field communication antennas

[Ruckshan]

Hi, I'm working on a project on the above topic, regarding both manual and automatic matching in NFC antennas. What are some good resources where I can find the values of the capacitors for manual matching in NFC antennas?

I also need help on designing a relatively simple feedback loop for automatic impedance matching in NFC antennas. Know any good resources for that?

Many thanks for your help.