Data carrier having a communication resonant circuit and having means for changing the resonant frequency of this resonant circuit in either sense

摘要

A data carrier (1) for contactless communication with a communication station has a substrate means (2) and a communication resonant circuit (3) connected to the substrate means (2) and consisting of a communication coil (4) and of a capacitor configuration (6) and having a resonant frequency (fR) which should have a nominal value, changing means (9) for changing the resonant frequency (fR) being provided, which changing means enable the resonant frequency (fR) to be changed from an initial value both to higher frequency values and to lower frequency values.