Patent ID: 6708891
Filing Date: 2004-03-23
Classification: G06K

Abstract:
A data carrier (1) for providing contactless communication with a communication station, comprising a substrate means (2) and a communication resonant circuit (3) connected to the substrate means (2), said communication resonant circuit (3) consisting of at least one communication coil (4) and of a capacitor configuration (6) connected to the at least one communication coil (4) in an electrically conductive manner, said communication resonant circuit (3) having a resonant frequency (fR) and changing means (9) for changing the resonant frequency (fR), wherein said changing means (9) are adapted to increase said resonant frequency (fR) from an initial value to a desired value if said initial value is lower than said desired value, as well as to decrease said resonant frequency (fR) from said initial value to said desired value if said initial value is higher than said desired value.