Process for controlling antennas
AssigneeSiemens VDO Automotive Corporation
InventorAlain Brillon
Life of this patent
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Abstract
This process is adapted for at least two groups of antennas (4, 6). A modulated signal is emitted by a first group of antennas (4) whilst the antennas (6) of a second group emit a similar modulated parasitic signal but of less amplitude. An unmodulated signal of an amplitude comprised between the amplitude of the parasitic signal and the amplitude of the signal emitted by the first group of antennas (4) is superposed on the parasitic signal emitted by the antennas (6) of the second group. Application to a free hand system for access and/or starting of an automotive vehicle.
Claims5
Process for controlling at least two groups of antennas (4, 6) according to which a modulated signal (26) is emitted by a first group of antennas (4) whilst the antennas (6) of a second group emit a similar modulated parasitic signal (28), but of less amplitude,
- characterized in that an unmodulated signal (38) of an amplitude comprised between the amplitude of the parasitic signal (28) and the amplitude of the signal (26) emitted by the first group of antennas (4) is superposed on the parasitic signal (28) emitted by the antennas (6) of the second group.
Device for controlling antennas distributed in at least two groups of antennas (4, 6) comprising a modulator (8), a multiplexer (10) disposed downstream of the modulator as well as an amplifier circuit (12) disposed between each group of antennas and the multiplexer, characterized in that a branch circuit (34) comprising a resistance (36) connects a point upstream of the modulator (8) to a point downstream of the multiplexer (10), upstream of an amplifier circuit corresponding to a group of antennas.
Dependencies are inferred from the claim text.