US 7,444,118 B2 · Electronic communications system

Abstract

In order that an electronic communications system (100) equipped with: [a.1] at least one base station (10), to which [a.2] at least one LC resonant circuit (13, 16) [a.2.1] with at least one antenna unit (16) in the form of a coil, and [a.2.2] at least one capacitive unit (13) series-connected to the antenna unit (16) is assigned, which base station (10) 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 [b.1] at least one transponder station (40), to which [b.2] at least one antenna unit (44) in the form of a coil is assigned, which transponder station (40) can be carried by, in particular, an authorized user and/or is designed for the exchanging of data signals (22, 24) with the base station (10), wherein the utilization and/or access entitlement is determined and/or the base station (10) can be controlled accordingly by means of these data signals (22, 24), may be further developed in such a way that it can be relied upon that a detuning of the resonant frequency of the LC resonant circuit (13, 16) no longer occurs, it is proposed that the resonant frequency of the LC resonant circuit (13, 16) is set to a predetermined desired value, and/or calibrated, by means of at least one tuning circuit (17, 18) connected in parallel with the antenna unit (16) and/or in parallel with the capacitive unit (13).

Claims12

Dependent claims

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.

8 more elements

A transponder station for an electronic communications system, which electronic communications system comprises:

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, where
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,
characterized by at least one electrical or electronic circuit configuration connected to the antenna unit.

8 more elements

A base unit, in particular a transponder communications device, for an electronic communications system, which comprises:

at least one base station, which is assigned to
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
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 extension of data signals with the base station, within the utilization and/or access entitlement is determined and/or the base station can be controlled accordingly by means of these data signals, wherein
at least one tuning circuit is connected in parallel with the antenna unit and/or in parallel with the capacitive unit, wherein the at least one tuning circuit comprises:
at least a 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, characterized by
at least one base station,
at least one microcontroller unit connected to the base station and/or
at least one (analog) interface connected to the microcontroller unit.

10 more elements

Dependencies are inferred from the claim text.

Electronic communications system

Life of this patent

Electronic communications system

Life of this patent

Abstract

Claims12