Antenna for a central locking system of an automotive vehicle
An antenna for a keyless entry radiofrequency system of a vehicle has an antenna cable, a conductor of which extends through an opening in the vehicle body with a free end outside said vehicle to prevent shielding of the free end by the vehicle body.
1. An automotive vehicle comprising:
a vehicle body;
a central locking system in said vehicle body and comprising a radiofrequency receiver and locks operated by said receiver;
an antenna connected to said receiver for receiving radiofrequency signals transmitted to said vehicle body and transmitting radiofrequency signals from said vehicle body, said body having an opening between an interior and an exterior thereof and said antenna having an antenna cable provided with a conductor extending through said opening and having a free end terminating at the exterior of said opening; and
a device actuatable from the exterior of said body for producing a radiofrequency signal for pick up by said conductor.
2. The automotive vehicle defined in claim 1 , further comprising an antenna structure on said vehicle body and capable of receiving and transmitting signals for a multiplicity of radio services, said antenna structure having at least one feeder to circuitry within said antenna structure, said conductor extending into said antenna structure.
3. The automotive vehicle defined in claim 2 wherein said antenna cable extends into an antenna housing forming part of said structure.
4. The automotive vehicle defined in claim 3 wherein said antenna structure is formed with an electrically conducting surface, said free end terminating at said surface.
5. The automotive vehicle defined in claim 3 wherein said antenna cable includes a plug for connection to a receiving and transmitting unit.
6. The automotive vehicle defined in claim 3 wherein said cable includes means for supplying electric current to circuitry of said antenna structure.
7. The automotive vehicle defined in claim 3 , further comprising a capacitor for coupling signals from said conductor.
8. The automotive vehicle defined in claim 7 wherein said capacitor is incorporated in a plug connector for said cable.