Antenna for transmitting and/or receiving radio waves by way of electromagnetic induction
First Claim
1. In an automotive keyless entry system for operating a vehicle device by means of a radio code signal transmitter transmitting a radio signal indicative of a preset code which identifies said radio code transmitter, and a controller receiving said radio signal and comparing the received code with a preset code therein for generating a control signal for operating said vehicle device when the received code matches said preset code in said controller, said transmitter having a loop antenna, and said controller being connected with a loop antenna mounted on a vehicle body and adapted to establish radio signal communication between said loop antenna in said transmitter by way of electromagnetic induction,said antenna to be mounted on said vehicle body comprising:
- a first loop antenna component forming a planar antenna loop;
a second loop antenna component having a smaller loop and disposed within the circumference of said first loop antenna component, the axis of said second loop antenna component being substantially perpendicular to the axis of said first loop antenna component; and
a coupling means for coupling between said first loop antenna component and said second loop antenna component by way of inductive coupling.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna for an automotive keyless entry system can ensure radio-wave transmission between a transmitter and a controller and can be conveniently mounted on a vehicle body. The antenna for an automotive keyless entry system, has a first planar antenna loop, and a second antenna loop disposed within the first antenna loop and lying in the plane thereof. The axis of the second antenna loop is substantially perpendicular to the axis of the first antenna loop. The first and second antenna loops form an antenna assembly which can be conveniently mounted on the vehicle body as, for example, within a door mirror of the vehicle.
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Citations
33 Claims
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1. In an automotive keyless entry system for operating a vehicle device by means of a radio code signal transmitter transmitting a radio signal indicative of a preset code which identifies said radio code transmitter, and a controller receiving said radio signal and comparing the received code with a preset code therein for generating a control signal for operating said vehicle device when the received code matches said preset code in said controller, said transmitter having a loop antenna, and said controller being connected with a loop antenna mounted on a vehicle body and adapted to establish radio signal communication between said loop antenna in said transmitter by way of electromagnetic induction,
said antenna to be mounted on said vehicle body comprising: -
a first loop antenna component forming a planar antenna loop; a second loop antenna component having a smaller loop and disposed within the circumference of said first loop antenna component, the axis of said second loop antenna component being substantially perpendicular to the axis of said first loop antenna component; and a coupling means for coupling between said first loop antenna component and said second loop antenna component by way of inductive coupling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17, 18)
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9. A keyless entry system for an automotive vehicle device for actuating the vehicle device, comprising:
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an electrical actuator connected to said vehicle device and responsive to a control signal to operate said vehicle device into one of at least first and second positions in response to said control signal; a manual switch; a transmitter responsive to a radio demand signal for transmitting a radio code signal indicative of a unique code which identifies said transmitter; a first antenna associated with said transmitter for transmitting said radio code signal; a controller responsive to manual operation of said manual switch to generate said radio demand signal to said transmitter, said controller receiving said radio code signal from said transmitter, to compare said unique code with a preset code, and to generate said control signal when said unique code matches said preset code; a second and third antenna mounted on a vehicle for establishing radio signal communication between said first antenna by way of electromagnetic induction, said second antenna forming a first planar antenna loop, and said third antenna being disposed in the plane of said first loop and forming a second antenna loop, the axis of which lies substantially perpendicular to the axis of said first antenna loop; and a coupling means for coupling between said second antenna and third antenna by way of inductive coupling. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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19. In an automotive keyless entry system for operating a vehicle transmitting a radio signal indicative of a preset code which identifies said radio code transmitter, and a controller receiving said radio signal and comparing the received code with a preset code therein for generating a control signal for operating said vehicle device when the received code matches said preset code in said controller, said transmitter having a loop antenna, and said controller being connected with a loop antenna mounted on a vehicle body and adapted to establish radio signal communication between said loop antenna in said transmitter by way of electromagnetic induction,
said antenna to be mounted on said vehicle body comprising: -
a first loop antenna component forming a planar antenna loop; a second loop antenna component having a smaller loop and disposed within the circumference of said first loop antenna component, the axis of said second loop antenna component being substantially perpendicular to the axis of said first loop antenna component; and a coupling means for coupling between said first loop antenna component and said controller and between said second loop antenna component and said controller by way of inductive coupling. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A keyless entry system for an automotive vehicle device for actuating the vehicle device, comprising:
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an electrical actuator connected to said vehicle device and responsive to a control signal to operate said vehicle device into one of at least first and second positions in response to said control signal; a manual switch; a transmitter responsive to a radio demand signal for transmitting a radio code signal indicative of a unique code which identifies said transmitter; a first antenna associated with said transmitter for transmitting said radio code signal; a controller responsive to manual operation of said manual switch to generate said radio demand signal to said transmitter, said controller receiving said radio code signal from said transmitter, to compare said unique code with a preset code, and to generate said control signal when said unique code matches said preset code; a second and third antenna mounted on a vheicle for establishing radio signal communication between said first antenna by way of electromagnetic induction, said second antenna forming a first planar antenna loop, and said third antenna being disposed in the plane of said first loop and forming a second antenna loop, the axis of which lies substantially perpendicular to the axis of said first antenna loop; and a coupling means for coupling between said first and second antenna loops and said controller by way of inductive coupling. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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Specification