Recognition and identification key having adaptable resonant frequency and methods of adapting same
First Claim
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1. A method of changing the resonant frequency of a recognition and identification key comprising:
- providing a dielectric substrate;
providing a first conductive layer having a first inductance on one surface of the substrate;
providing a second conductive layer on an opposed surface of the substrate, the second layer having a second inductance and forming a first capacitance with the first layer such that the first and second inductance and the first capacitance are resonant at a first frequency, at least one of the layers having a configuration which is capable of being changed; and
changing the configuration of the layers such that the key is resonant at a predetermined second frequency.
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Abstract
A recognition and identification key comprising a substrate formed from an electrically insulating material, a first sheet of conductive material formed on a first surface of the substrate in a looping pattern so as to provide an inductive element, and a capacitive element coupled to the first sheet such that the elements are resonant at a first frequency, at least one of the inductive and capacitive elements capable of being changed such that the key is resonant at a second frequency, and a method of adapting the resonant frequency.
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Citations
22 Claims
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1. A method of changing the resonant frequency of a recognition and identification key comprising:
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providing a dielectric substrate; providing a first conductive layer having a first inductance on one surface of the substrate; providing a second conductive layer on an opposed surface of the substrate, the second layer having a second inductance and forming a first capacitance with the first layer such that the first and second inductance and the first capacitance are resonant at a first frequency, at least one of the layers having a configuration which is capable of being changed; and changing the configuration of the layers such that the key is resonant at a predetermined second frequency. - View Dependent Claims (2)
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3. A method of changing the resonant frequency of a recognition and identification key comprising:
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providing a dielectric substrate; providing a first conductive layer having a first side, a plurality of plates and a like plurality of stubs each connecting one of said plates to said first side, said first layer forming a first inductance on one surface of the substrate; providing a second conductive layer having a second side on an opposed surface of the substrate with such second side being subjacent to said plates and forming a first capacitance, the second layer having a second inductance such that the first and second inductances and the first capacitance are resonant at a first frequency; and severing said first side at a selected location so as to electrically remove corresponding ones of said plates from said capacitive element and cause said key to resonate at a predetermined second frequency.
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4. A method of changing the resonant frequency of a recognition and identification key comprising:
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providing a dielectric substrate; providing a first conductive layer having an outer side, a plurality of plates and a like plurality of stubs each connecting one of said plates to said outer side, said first layer forming a first inductance on one surface of the substrate; providing a second conductive layer having an outer side of an opposed surface of the substrate with such outer side being subjacent to said plates and forming a first capacitance, the second layer having a second inductance such that the first and second inductances and the first capacitance are resonant at a first frequency; and severing said outer side of said first layer at a selected location so as to electrically remove corresponding ones of said plates from said capacitive element and cause said key to resonate at a predetermined second frequency.
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5. A method of changing the resonant frequency of a recognition and identification key comprising:
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providing a dielectric substrate; providing a first conductive layer having an outer side, a plurality of plates and a like plurality of stubs each connecting one of said plates to said outer side, said first layer forming a first inductance on one surface of the substrate; providing a second conductive layer having an outer side on an opposed surface of the substrate with such outer side being subjacent to said plates and forming a first capacitance, the second layer having a second inductance such that the first and second inductances and the first capacitance are resonant at a first frequency; and selectively severing said stubs so as to electrically remove corresponding ones of said plates from said capacitive element and cause said key to resonate at a predetermined second frequency.
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6. A method of changing the resonant frequency of a recognition and identification key comprising:
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providing a dielectric substrate; providing a first spiral conductive layer having interconnected first, second and third inner sides formed into a generally U-shaped configuration and having a first inductance on one surface of the substrate; providing a second spiral conductive layer having a fourth inner side of an opposed surface of the substrate with said fourth said subjacent to said first side such that said first, second, third and fourth sides have a closed-loop configuration in plan view, the second layer having a second inductance and forming a first capacitance with the first layer such that the first and second inductance and the first capacitance are resonant at a first frequency; and selectively removing portions of said sides in such a manner as to cause said key to resonate at a predetermined second frequency. - View Dependent Claims (7)
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8. A recognition and identification key for use in an electronic identification system comprising:
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a substrate formed of an electrically insulating material and having a generally planar first surface; a first sheet of conductive material formed on said first surface in a looping pattern so as to provide an inductive element; said first sheet including an inner end, an outer end and comprising a length of flexible conductive material connected to said inner and said outer ends with said first sheet forming an enclosed loop having a first area corresponding to a first inductance, said length being movable such that the area and hence said first inductance is capable of being changed to cause a corresponding change in resonant frequency; and a capacitive element having a capacitance reactance and being coupled to said first sheet such that said elements are resonant at a first sheet such that said elements are resonant at a first frequency, at least one of said inductive and capacitive elements capable of being changed such that the key is resonant at a second frequency. - View Dependent Claims (9, 10)
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11. A recognition and identification key for use in an electronic identification system comprising:
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a substrate formed of an electrically insulated material and having a generally planar first surface; a first sheet of conductive material formed on said first surface in a looping pattern so as to provide an inductive element; a capacitance element having a capacitive reactance and being coupled to said first sheet such that said elements are resonant at a first frequency, at least one of said inductive and capacitive elements capable of being changed such that the key is resonant at a second frequency; and further including a first layer comprised of a second dielectric material disposed in a coating relationship over said first sheet and the exposed portions of said substrate, said first layer serving to protect said elements, and a second layer formed of a third dielectric material overlaying said first layer and serving to encapsulate the key.
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12. A method of changing the resonant frequency of a recognition and identification key comprising:
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providing a dielectric substrate; providing a first conductive layer forming a first inductive element on one surface of the substrate, said first layer having a generally spiral shape; providing a length of wire between opposed ends of said first layer so as to enclose a first area; and providing a capacitive element that is electrically coupled to said first layer such that the elements are resonant at a first frequency, at least one of the elements having a configuration which is capable of being changed; and changing the configuration of the elements by selectively moving the length of said wire to enclose a second area such that the key is resonant at a predetermined second frequency.
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13. A method of changing the resonant frequency of a recognition and identification key comprising:
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providing a dielectric substrate; providing a first conductive layer forming a first inductive element on one surface of the substrate; providing a capacitive element that is electrically coupled to said first layer such that the elements are resonant at a first frequency, at least one of the elements having a configuration which is capable of being changed, said capacitive element including first and second leads each comprising a length of wire connected to opposed ends of said first layer so as to enclose a first area; and changing the configuration of the elements by moving the lengths of said wire to enclose a second area such that the key is resonant at a predetermined second frequency.
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14. A method of changing the resonant frequency of a recognition and identification key comprising:
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providing a dielectric substrate; providing a first conductive layer forming a first inductive element on one surface of the substrate; providing a capacitive element that is electrically coupled to said first layer such that the elements are resonant at a first frequency, at least one of the elements having a configuration which is capable of being changed; changing the configuration of the elements such that the key is resonant at a predetermined second frequency; forming a second layer of a dielectric material over said elements and the exposed portions of said substrate; and forming a third layer of a dielectric material over said second layer so as to encapsulate said key.
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15. A recognition and identification key for use in an electronic identification system comprising:
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a substrate formed from a dielectric material and having opposed first and second surfaces; a first elongated sheet of conductive material formed on said first surface in a looping pattern; and a second elongated sheet of conductive material formed on said second surface in a looping pattern, said first and second sheets forming an inductive element having a characteristic inductance and simultaneously forming a capacitive element having a characteristic capacitance, said elements being resonant at a first frequency, at least one of said inductive and capacitive elements capable of being changed such that the card is resonant at a second frequency or a multiplicity of other frequencies. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification