I am working with MFRC522 in our project. I can't properly design RFID coil antenna for our project. I am try to design a circular antenna. I am attached the pdf which I refer for this.
I used the reader circuit as same as MFRC522 reader.
Inductance - 2.2 micro henry
Number of turns I get from the equation in page number 46.
I think my problem is can't find the tuning capacitance value of the antenna.