Automatic Impedance Matching for 13.56 MHz NFC Antennas
M. Roland, C. Saminger, H. Witschnig, E. Merlin - Automatic Impedance Matching for 13.56 MHz NFC Antennas - Proceedings of the Sixth International Symposion of Communication Systems, Networks and Digital Signal Processing, Graz, Österreich, 2008, pp. 288-291
This paper deals with the concept, the implementation and the verification of an automatic impedance matching circuit for NFC antennas with a frequency of 13.56 MHz. Besides an introduction to manual tuning and its issues, the fundamental components of an automatic tuning system are outlined. A lab-scaled prototype is built and demonstrated. In the end, the successful operation of this system is tested with several different antennas.