Patent ID: 7444118
Filing Date: 2008-10-28
Classification: B60R

Abstract:
1. An electronic communications system, equipped with at least one base station, to which at least one LC resonant circuit with at least one antenna unit in the form of a coil, and at least one capacitive unit series-connected to the antenna unit is assigned, which base station is arranged, in particular, on an object to be secured against unauthorized use and/or against unauthorized access, such as on a means of locomotion, on an access system or on an entry system, and at least one transponder station, to which at least one antenna unit in the form of a coil is assigned, which transponder station can be carried by, in particular, an authorized user and/or is designed for the exchanging of data signals with the base station, wherein the utilization and/or access entitlement is determined and/or the base station can be controlled accordingly by means of these data signals, characterized in that connected in parallel with the antenna unit and/or in parallel with the capacitive unit is at least one tuning circuit, equipped with at least one first element in the form of at least one capacitive unit or in the form of at least one inductive unit, and at least one regulating resistor, series-connected to the first element, the variable resistance value of which regulating resistor can be controlled in order to set and/or to calibrate the resonant frequency of the LC resonant circuit.