Antitheft system, method for operating an antitheft system and components of an antitheft system
First Claim
1. An antitheft system for a vehicle having at least one radio frequency receiver unit which is connected to the vehicle and has at least one first antenna, at least one code transmitter having at least one radio frequency transmitter unit which has at least one second antenna, and means for evaluating signals which are received by the at least one receiver unit, wherein at least the first antenna or the second antenna is a directional antenna.
3 Assignments
0 Petitions
Accused Products
Abstract
An antitheft system for a vehicle has at least one radio frequency receiver unit (10) which is connected to the vehicle and has at least one first antenna (12), at least one code transmitter (14) with at least one radio frequency transmitter unit which has at least one second antenna (16), and means for evaluating signals which are received by the at least one receiver unit (10). The first antenna (12) or the second antenna (16) is a directional antenna.
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Citations
18 Claims
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1. An antitheft system for a vehicle having
at least one radio frequency receiver unit which is connected to the vehicle and has at least one first antenna, at least one code transmitter having at least one radio frequency transmitter unit which has at least one second antenna, and means for evaluating signals which are received by the at least one receiver unit, wherein at least the first antenna or the second antenna is a directional antenna.
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8. A method for operating an antitheft system for a vehicle, in which
at least one radio frequency receiver unit which is connected to the vehicle receives radio frequency signals via a first antenna, at least one code transmitter having at least one radio frequency transmitter unit transmits radio frequency signals via at least one second antenna, and the at least one receiver unit evaluates received signals, wherein at least the first antenna or the second antenna is a directional antenna.
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15. Radio frequency receiver unit for use in an antitheft system for a vehicle comprising:
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a driver for receiving data to be transmitted;
a transmitter unit coupled with the driver for modulating the data;
an antenna coupled with the transmitter unit, wherein the antenna is a directional antenna and wherein the radio frequency receiver is connected to the vehicle. - View Dependent Claims (16, 17)
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18. A code transmitter for use in an antitheft system for a vehicle comprising:
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a directional antenna for receiving and transmitting of antitheft system data;
a back scatter unit coupled with the directional antenna; and
a dielectric resonance oscillator coupled with the back scatter unit.
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Specification