Radio frequency identification tag and method
First Claim
1. A tag which uses radio frequency waves transmitted from a scanning device in order to identify an item to which said tag is attached or with which said tag is associated comprising:
- an insulating layer having a top surface, a bottom surface, and side surfaces;
thin conductive metallic means adjacent either said top surface or said bottom surface of said tag for forming a plurality of circuits, wherein each circuit of said plurality of circuits has a unique resonant frequency formed by one-to-one correspondence of a capacitance made up of a single capacitor and an inductance made up of a single inductor coil having two conductive ends with a first conductive end being connected to said single capacitor in order for said inductor coil to wind around said capacitor to end in a second conductive end which crosses said single inductor coil in a layer above said inductor coil so that said second conductive end is above said inductor coil and separated from said inductor coil by an insulated layer in order for said second conductive end to connect to said capacitor to close each said circuit without shorting out the circuit; and
wherein said tag is associated with a binary number established by a pattern of ones and zeros depending on each circuits'"'"' resonance or nonresonance, respectively, and each circuits'"'"' position on said tag with respect to a binary table.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of and apparatus for identifying an item to or with which a radio frequency identification tag is attached or associated is provided. The tag is made of a nonconductive material to have a flat surface on which a plurality of circuits are pressed, stamped, etched or otherwise positioned. Each circuit has a capacitance and an inductance. The capacitance is formed from the capacitive value of a single capacitor. The inductance is formed from the inductive value of a single inductor coil having two conductive ends each connected to the capacitor. Each tag is associated with a binary number established from a pattern of binary ones and zeros which depend on the resonance or nonresonance of each circuit, respectively and the circuits position with respect to the binary table. The binary number may be converted to a decimal number using the binary table for conversion.
34 Citations
40 Claims
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1. A tag which uses radio frequency waves transmitted from a scanning device in order to identify an item to which said tag is attached or with which said tag is associated comprising:
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an insulating layer having a top surface, a bottom surface, and side surfaces;
thin conductive metallic means adjacent either said top surface or said bottom surface of said tag for forming a plurality of circuits, wherein each circuit of said plurality of circuits has a unique resonant frequency formed by one-to-one correspondence of a capacitance made up of a single capacitor and an inductance made up of a single inductor coil having two conductive ends with a first conductive end being connected to said single capacitor in order for said inductor coil to wind around said capacitor to end in a second conductive end which crosses said single inductor coil in a layer above said inductor coil so that said second conductive end is above said inductor coil and separated from said inductor coil by an insulated layer in order for said second conductive end to connect to said capacitor to close each said circuit without shorting out the circuit; and
wherein said tag is associated with a binary number established by a pattern of ones and zeros depending on each circuits'"'"' resonance or nonresonance, respectively, and each circuits'"'"' position on said tag with respect to a binary table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of identifying an item to or with which a radio frequency identification tag is attached or associated, respectively, comprising the method steps of:
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providing said radio frequency identification tag having a top surface, a bottom surface and side surfaces with a plurality of circuits each having a capacitance and an inductance both located on either said top surface or said bottom surface of said tag to form a one-to-one correspondence and to have a resonating frequency wherein said capacitance comprises a single capacitor and said inductance comprises a single inductor coil such that said inductor coil has two conductive ends with a first conductive end connected to said capacitor in order for said inductor coil to wind around said capacitor and end in a second conductive end which crosses said single inductor coil in a layer above said inductor coil so that said second conductive end is above said inductor coil and separated from said inductor coil by an insulated layer in order for said second conductive end to connect to said capacitor to close each said circuit without shorting out the circuit;
using a scanning device to interrogate said circuits by means of said scanner transmitting varying radio frequency waves at which said circuits may resonate; and
interrogating said circuits to establish a pattern of binary ones and zeros wherein a binary one is given to a resonant circuit and a binary zero a nonresonant circuit. - View Dependent Claims (18, 19)
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- 20. A resonant circuit including a single capacitor, a single inductor coil electrically connected to said single capacitor, and an insulating layer separating from each other portions of at least one of said single capacitor and said single inductor coil that cross over each other, and said single capacitor and said single inductor disposed on a same surface of a substrate.
- 27. A resonant circuit having two opposing sides including a single capacitor, and a single inductor coil electrically connected to said single capacitor, and said capacitor and said single inductor coil are located on the same side of a resonance tag and disposed on a common surface of a substrate, wherein the substrate is adjacent to one of said two opposing sides of said resonant circuit.
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34. A resonant circuit which resonates radio frequency waves transmitted from a scanning device and having a resonant frequency associated therewith, comprising:
- 35. A method of producing or manufacturing one or more resonant circuits disposed on a substrate of a radio frequency identification tag, comprising sequential, non-sequential or independent steps of:
- 38. A method of producing or manufacturing one or more resonant circuits including a single capacitor and a single inductor coil having first and second ends and each disposed on a same side of a substrate of a radio frequency identification tag, comprising sequential, non-sequential or independent steps of:
Specification