Title :
Automatic impedance matching for 13.56 MHz NFC antennas
Author :
Roland, Michael ; Witschnig, Harald ; Merlin, E. ; Saminger, Christian
Author_Institution :
Upper Austria Univ. of Appl. Sci., Hagenberg
Abstract :
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.
Keywords :
HF antennas; impedance matching; automatic impedance matching; frequency 13.56 MHz; manual tuning; near field communication antennas; Antenna accessories; Circuit optimization; Current supplies; Impedance matching; Radio frequency; Radio transmitters; Radiofrequency identification; Shape measurement; Transmitting antennas; Tuning;
Conference_Titel :
Communication Systems, Networks and Digital Signal Processing, 2008. CNSDSP 2008. 6th International Symposium on
Conference_Location :
Graz
Print_ISBN :
978-1-4244-1875-6
Electronic_ISBN :
978-1-4244-1876-3
DOI :
10.1109/CSNDSP.2008.4610705
