Unauthorized entry detection system
First Claim
1. An unauthorized entry detection system for an automotive vehicle having a passenger compartment of a given size, comprising:
- oscillator means, adapted to be disposed in said vehicle, for generating an oscillation signal having a predetermined frequency corresponding to said passenger compartment size;
first antenna means, adapted to be disposed within said passenger compartment and coupled to said oscillator means, for generating an electromagnetic wave inside said passenger compartment to cause said passenger compartment to resonate as a cavity resonator at said predetermined frequency, said electromagnetic wave corresponding to said oscillation signal;
second antenna means, adapted to be disposed in said passenger compartment, for generating an induced voltage in response to a magnetic component of said electromagnetic wave; and
detecting means, coupled to said second antenna means, for detecting a change in said induced voltage and providing a detection signal corresponding to said change.
1 Assignment
0 Petitions
Accused Products
Abstract
In an unauthorized entry detection system for automotive vehicles, an oscillator is installed within the passenger compartment of the vehicle to generate an electromagnetic wave with a predetermined frequency defined by the interior size of the compartment, a first antenna connected to the oscillator to propagate the electromagnetic wave in the whole interior of the compartment in such a manner that the compartment resonates as a cavity resonator when all the doors and windows are closed, a second antenna arranged within the compartment to generate an induced voltage in response to the magnetic field component of the propagated electromagnetic wave, and a detecting circuit connected to the second antenna to detect a change of the induced voltage level caused by entry of a human body into the compartment and/or opening of the doors or windows, thereby to generate a detection signal therefrom.
-
Citations
11 Claims
-
1. An unauthorized entry detection system for an automotive vehicle having a passenger compartment of a given size, comprising:
-
oscillator means, adapted to be disposed in said vehicle, for generating an oscillation signal having a predetermined frequency corresponding to said passenger compartment size; first antenna means, adapted to be disposed within said passenger compartment and coupled to said oscillator means, for generating an electromagnetic wave inside said passenger compartment to cause said passenger compartment to resonate as a cavity resonator at said predetermined frequency, said electromagnetic wave corresponding to said oscillation signal; second antenna means, adapted to be disposed in said passenger compartment, for generating an induced voltage in response to a magnetic component of said electromagnetic wave; and detecting means, coupled to said second antenna means, for detecting a change in said induced voltage and providing a detection signal corresponding to said change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An unauthorized entry detection system for an automotive vehicle having a passenger compartment of a given size, comprising:
-
oscillator means, adapted to be disposed in said vehicle, for generating an oscillation signal having a predetermined frequency corresponding to said passenger compartment size; first antenna means, adapted to be disposed within said passenger compartment and coupled to said oscillator means, for generating an electromagnetic wave inside said passenger compartment to cause said passenger compartment to resonate as a cavity resonator at said predetermined frequency, said electromagnetic wave corresponding to said oscillation signal, said first antenna means including a first pair of upright metallic rods adapted to be disposed in a passenger seat in said passenger compartment; second antenna means, adapted to be disposed in said passenger compartment, for generating an induced voltage in response to a magnetic component of said electromagnetic wave, said second antenna means including a second pair of upright metallic rods adapted to be disposed in a passenger seat in said passenger compartment; and detecting means, coupled to said second antenna means, for detecting a change in said induced voltage and providing a detection signal corresponding to said change.
-
-
11. An unauthorized entry detection system for an automotive vehicle having a passenger compartment of a given size, comprising:
-
oscillator means, adapted to be disposed in said vehicle, for generating an oscillation signal having a predetermined frequency corresponding to said passenger compartment size; first antenna means, adapted to be disposed within said passenger compartment and coupled to said oscillator means, for generating an electromagnetic wave inside said passenger compartment to cause said passenger compartment to resonate as a cavity resonator at said predetermined frequency, said electromagnetic wave corresponding to said oscillation signal, said first antenna means including a first loop antenna adapted to be disposed in a passenger seat in said passenger compartment; second antenna means, adapted to be disposed in said passenger compartment, for generating an induced voltage in response to a magnetic component of said electromagnetic wave, said second antenna means including a second loop antenna adapted to be disposed in a passenger seat in said passenger compartment; and detecting means, coupled to said second antenna means, for detecting a change in said induced voltage and providing a detection signal corresponding to said change.
-
Specification