Patent ID: 6778070
Filing Date: 2004-08-17
Classification: G06K

Abstract:
Remote transmission apparatus for a portable object equipped with an antenna having terminals and connected by inductive coupling to a fixed station that is equipped with a power supply and at least one antenna that emits an alternating magnetic field and receives signals transmitted by the portable object, comprising:a data processor for processing and storing data concerning the portable object; a voltage rectifier for transforming the AC voltage supplied by the antenna into a DC voltage carried by a power line to the data processor, said rectifier having inputs and outputs; a voltage regulator for regulating the DC voltage provided by said rectifier, said regulator having an input and an output, said inputs being connected to the terminals of the antenna; and a modulator for modulating the signals to be transmitted, said modulator having an input and an output; wherein the modulator comprises a transistor connected to an electronic dipole that causes a drop in voltage between the input and output of said modulator, the output of said modulator being connected to the inputs of the voltage regulator and the input of said modulator being connected to the outputs of said rectifier, the voltage on the terminals of the antenna being regulated by the voltage regulator, the modulation of the signal transmitted to the antenna being a current modulation.