Access Control System for a Vehicle
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is an access control device for a vehicle, comprising at least one transmission unit arranged in the vehicle and at least one receiver, controlled by at least one microcomputer unit. The receiver serves to receive UHF signals and the transmission unit serves to send low-frequency long-wave signals. Also, a clamping unit is present which is triggered by the microcomputer unit and the clamping unit gives access to the vehicle when a matching code is present.
The transmission unit has two connected LC band pass filters, whereby the first band pass is a pre-filter comprises a first coil and a first condenser group comprising at least one condenser and the second band pass comprises the LF antenna as inductor and a second condenser group comprising at least one condenser. A multiplexer, via which the antennae are connected successively in multiplex mode to the transmission unit, is preferably provided between the first and second band pass.
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Citations
26 Claims
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1-13. -13. (canceled)
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14. An access control device for a vehicle
at least one transmission unit (4) arranged in the vehicle for sending low-frequency long-wave signals; - and
a plurality of assigned LF antennae (13), arranged in the vehicle at exposed points, wherein the transmission unit (4) has two connected LC band pass filters, whereby the first band pass as pre-filter consists of a first coil (L1) and a first condenser group comprising at least one condenser (C1 VK, C2 VK, C3 VK, . . . ) and the second band pass consists of the LF antenna (Lant) as inductor and a second condenser group comprising at least one condenser (C2, C Ant 01, C Ant 02, . . . ). - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification