Electronic license plate for motor vehicles
First Claim
1. A unitary license tag for mounting on a vehicle for use in a cooperative signalling system of the type wherein an interrogating station remote from said vehicle directs interrogation signals to said tag, and in response thereto said tag transmits reply signals to said interrogation station, the improvement comprising:
- a. a first generally planar member of said tag having first and second opposing faces, said first member being formed of an electrically non-conductive material and having indicia visually displayed on said first face thereof;
b. a second generally planar member having first and second opposing faces, said second member first face being disposed in parallel with and adjacent to said first member second face, said second member being formed of a dielectric substrate for supporting electronic means receptive of said interrogation signals for generating said reply signal;
c. a third generally planar member having first and second opposing faces, said third member first face being disposed in parallel with said second member second face, said third member being formed of non-conducting material;
d. means for bonding said first, second and third members together in juxtaposed relation forming thereby a single unitary structure adapted for mounting on said vehicle;
e. said electronic means including,e1. an antenna network disposed on opposing portions of said second member first and second faces,e2. encoder means, attached to another portion of one face of said second member, for encoding said reply signals with coded information,e3. a first transmission line, disposed on another portion of said one face of said second member, coupled to said antenna,e4. a non-linear device, coupled to said transmission line and receptive of signals received by said antenna, for generating said reply signals at a harmonic frequency of the frequency of said received signals,e5. means for coupling said encoder means to said first transmission line, ande6. detector means receptive of said interrogation signals for detecting coded information included in said interrogation signals.
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Accused Products
Abstract
An electronic license tag or plate formed into a unitary structure and including a single antenna system cooperating in a system comprising a harmonic radiator which transmits a pulse coded identification signal in response to an interrogation signal, and in a signal communication path for detecting and decoding code modulations in the interrogation signal and deriving therefrom an information signal which is communicated to the operator of a vehicle to which the tag or plate is affixed.
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Citations
11 Claims
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1. A unitary license tag for mounting on a vehicle for use in a cooperative signalling system of the type wherein an interrogating station remote from said vehicle directs interrogation signals to said tag, and in response thereto said tag transmits reply signals to said interrogation station, the improvement comprising:
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a. a first generally planar member of said tag having first and second opposing faces, said first member being formed of an electrically non-conductive material and having indicia visually displayed on said first face thereof; b. a second generally planar member having first and second opposing faces, said second member first face being disposed in parallel with and adjacent to said first member second face, said second member being formed of a dielectric substrate for supporting electronic means receptive of said interrogation signals for generating said reply signal; c. a third generally planar member having first and second opposing faces, said third member first face being disposed in parallel with said second member second face, said third member being formed of non-conducting material; d. means for bonding said first, second and third members together in juxtaposed relation forming thereby a single unitary structure adapted for mounting on said vehicle; e. said electronic means including, e1. an antenna network disposed on opposing portions of said second member first and second faces, e2. encoder means, attached to another portion of one face of said second member, for encoding said reply signals with coded information, e3. a first transmission line, disposed on another portion of said one face of said second member, coupled to said antenna, e4. a non-linear device, coupled to said transmission line and receptive of signals received by said antenna, for generating said reply signals at a harmonic frequency of the frequency of said received signals, e5. means for coupling said encoder means to said first transmission line, and e6. detector means receptive of said interrogation signals for detecting coded information included in said interrogation signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for communicating information between a remote station and a vehicle comprising:
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means, in said remote station, for transmitting coded interrogation signals to said vehicle and for receiving coded reply signals from said vehicle; and a unitary license tag, affixed to said vehicle, said tag including; an antenna network, for receiving said interrogation signal and transmitting said reply signal, a first transmission line coupled to said antenna network, a non-linear device, coupled to said first transmission line and responsive to said interrogation signal and control signals applied thereto, for generating a signal at a harmonic frequency of said interrogation signal, said harmonic signal being transmitted by said antenna network as said reply signal, encoder means, coupled to said non-linear device, for generating said control signals to said non-linear device, in accordance with a preset code, whereby said harmonic signal is modulated in accordance with said preset code, a second transmission line, directionally coupled to said first transmission line, and a diode, coupled to said second transmission line and responsive to said interrogation signal, for detecting the coding of said interrogation signal.
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Specification