EP 1516389 B1 20080604 - LOW FREQUENCY RADIO TRANSMISSION DEVICE FOR MOTOR VEHICLE PASSIVE ENTRY SYSTEM
Title (en)
LOW FREQUENCY RADIO TRANSMISSION DEVICE FOR MOTOR VEHICLE PASSIVE ENTRY SYSTEM
Title (de)
NIEDERFREQUENZ-FUNKÜBERTRAGUNGSEINRICHTUNG FÜR EINE FAHRZEUGALARMANLAGE
Title (fr)
DISPOSITIF D EMISSION RADIOELECTRIQUE BASSE FREQUENCE POUR SYSTEME D'ACCES MAINS LIBRES POUR VEHICULE AUTOMOBILE
Publication
Application
Priority
- FR 0301903 W 20030620
- FR 0207792 A 20020624
Abstract (en)
[origin: WO2004001897A1] The invention concerns a radio transmission device comprising a driving circuit (GEN) which generates a driver signal (SC) of a series LC antenna (EA), suitable for radio transmission of a query signal in a passive entry system for motor vehicles. In order to increase the internal resistance of the driving circuit without affecting the value of the drive current, the circuit comprises a sinusoidal or quasi-sinusoidal current generator (600), delivering the driver signal in the form of a current control signal, thus attenuating variations in the range of the interface zone of the system by reducing the quality factor of the device.
IPC 8 full level
E05B 49/00 (2006.01); H01Q 1/32 (2006.01); B60R 25/01 (2013.01); B60R 25/24 (2013.01); G07C 9/00 (2006.01); H04B 1/59 (2006.01); H04B 5/02 (2006.01)
CPC (source: EP)
H01Q 1/3241 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
FR 2841393 A1 20031226; FR 2841393 B1 20060505; AU 2003255686 A1 20040106; DE 60321464 D1 20080717; EP 1516389 A1 20050323; EP 1516389 B1 20080604; JP 2005536911 A 20051202; JP 4221362 B2 20090212; WO 2004001897 A1 20031231
DOCDB simple family (application)
FR 0207792 A 20020624; AU 2003255686 A 20030620; DE 60321464 T 20030620; EP 03760762 A 20030620; FR 0301903 W 20030620; JP 2004514965 A 20030620