Identification device in the form of a tag-like strip affixable to an article
First Claim
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1. For use in electronic security systems, an identification device in the form of a tag-like strip containing a substantially planar resonant circuit comprising:
- an inductive member and a capacitive member,said inductive member and said capacitive member consisting of at least a first both inductively and capacitively reacting element and a second both inductively and capacitively reacting element being arranged in at least a first and a second plane, respectively,said at least first both inductively and capacitively reacting element consisting of at least a first arrangement of flat conductor strips in said at least first plane,said at least second both inductively and capacitively reacting element consisting of at least a second arrangement of flat conductor strips in said at least second plane,said at least first and second both inductively and capacitively reacting elements being arranged in an aligned opposition, spaced one from another by at least one dielectric layer,said at least one dielectric layer extending at least on mutually opposing surfaces of said at least first and second arrangements of flat conductor strips forming said at least first and second both inductively and capacitively reacting element, respectively,said aligned opposition of said at least first and second both inductively and capacitively reacting elements providing an aligned overlay of said at least first and second arrangements of flat conductor strips such that any mutually opposing segments of at least first and second flat conductor path portions of said at least first and second arrangements of flat conductor stripscapacitively interact to a maximum extent with one another,said at least first and second arrangements of flat conductor strips cooperating to form a coil having continuous turns of substantially uniform winding direction when viewed from one side of said planes,said opposing segments of at least first and second flat conductor path portions spaced one from another by said at least one dielectric layer thus cooperating to form an individual LC stripline portion having a distributed line capacitance and a distributed line inductance,said aligned overlay of said at least first and second arrangements of flat conductor strips thus representing the summed totality of all said individual LC stripline portions cooperating to form an LC circuit,said cooperation of said individual LC stripline portions to form an LC circuit thus being realized by said at least first and second flat conductor strips being arranged in said at least first and second respective planes and being spaced by said at least one dielectric layer forming a plurality of individual LC stripline loop portions,said individual LC stripline loop portions being cascadingly stacked to form an LC stripline circuit construction exhibiting distributed line capacitances integrally summing to an overall effective capacitance owing to the surface areas of said mutually opposing at least first and second flat conductor strips and properties of said at least one dielectric layer spacing them one from another,and exhibiting distributed line inductances integrally summing to an overall effective inductance owing to distributed mutual magnetic coupling factors between said at least first and second flat conductor path portion arranged in an aligned overlay,said overall effective capacitance and said overall effective inductance and said distributed mutual magnetic coupling factors causing the capability of such said LC stripline circuit construction to resonate,said LC stripline circuit construction formed by a plurality of individual LC stripline loop portions being cascadingly stacked thus forming a substantially planar resonant circuit,said substantially planar resonant circuit being provided with a suitable cover to form said tag-like strip.
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Abstract
An identification device in the form of a tag-like strip, affixable to an article, for use in an electronic security system comprising opposingly situated conductor strip portions which may be punched out of a metal foil. The conductor strip portions are folded together along suitably positioned fold lines so that mutually superposed conductor strip portions form an uninterrupted winding of inductive elements having a dielectric positioned therebetween. The conductor strip portions can be fabricated on continuous roll and separated by transverse perforations.
143 Citations
30 Claims
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1. For use in electronic security systems, an identification device in the form of a tag-like strip containing a substantially planar resonant circuit comprising:
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an inductive member and a capacitive member, said inductive member and said capacitive member consisting of at least a first both inductively and capacitively reacting element and a second both inductively and capacitively reacting element being arranged in at least a first and a second plane, respectively, said at least first both inductively and capacitively reacting element consisting of at least a first arrangement of flat conductor strips in said at least first plane, said at least second both inductively and capacitively reacting element consisting of at least a second arrangement of flat conductor strips in said at least second plane, said at least first and second both inductively and capacitively reacting elements being arranged in an aligned opposition, spaced one from another by at least one dielectric layer, said at least one dielectric layer extending at least on mutually opposing surfaces of said at least first and second arrangements of flat conductor strips forming said at least first and second both inductively and capacitively reacting element, respectively, said aligned opposition of said at least first and second both inductively and capacitively reacting elements providing an aligned overlay of said at least first and second arrangements of flat conductor strips such that any mutually opposing segments of at least first and second flat conductor path portions of said at least first and second arrangements of flat conductor strips capacitively interact to a maximum extent with one another, said at least first and second arrangements of flat conductor strips cooperating to form a coil having continuous turns of substantially uniform winding direction when viewed from one side of said planes, said opposing segments of at least first and second flat conductor path portions spaced one from another by said at least one dielectric layer thus cooperating to form an individual LC stripline portion having a distributed line capacitance and a distributed line inductance, said aligned overlay of said at least first and second arrangements of flat conductor strips thus representing the summed totality of all said individual LC stripline portions cooperating to form an LC circuit, said cooperation of said individual LC stripline portions to form an LC circuit thus being realized by said at least first and second flat conductor strips being arranged in said at least first and second respective planes and being spaced by said at least one dielectric layer forming a plurality of individual LC stripline loop portions, said individual LC stripline loop portions being cascadingly stacked to form an LC stripline circuit construction exhibiting distributed line capacitances integrally summing to an overall effective capacitance owing to the surface areas of said mutually opposing at least first and second flat conductor strips and properties of said at least one dielectric layer spacing them one from another, and exhibiting distributed line inductances integrally summing to an overall effective inductance owing to distributed mutual magnetic coupling factors between said at least first and second flat conductor path portion arranged in an aligned overlay, said overall effective capacitance and said overall effective inductance and said distributed mutual magnetic coupling factors causing the capability of such said LC stripline circuit construction to resonate, said LC stripline circuit construction formed by a plurality of individual LC stripline loop portions being cascadingly stacked thus forming a substantially planar resonant circuit, said substantially planar resonant circuit being provided with a suitable cover to form said tag-like strip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. For use in an electronic security system, an identification device in the form of a tag-like strip affixable to an article, containing a substantially planar resonant circuit comprising
an inductive member and a capacitive member, said inductive member consisting of a first both inductively and capacitively reacting element and a second both inductively and capacitively reacting element being arranged in a first and second plane, respectively, said first both inductively and capacitively reacting element consisting of a first conductive spiral pattern having multiple turns, said second both inductively and capacitively reacting element consisting of a second conductive spiral pattern having multiple turns, said first and second conductive spiral patterns being constituted by first and second flat conductor strips, respectively, being arranged in said first and second plane, respectively, said first and second conductive spiral patterns being arranged in a generally aligned opposition to each other, spaced from each other by at least one dielectric layer, said at least one dielectric layer extending at least on mutually opposing surfaces of said first and second flat conductor strips, said generally aligned opposition of said first and second conductive spiral patterns each having multiple turns being made such that corresponding portions of said first and second flat conductor strips are in substantial registration with each other, thus providing an aligned overlay of said first and second flat conductor strips, said first and second conductive multiple-turn spiral patterns having opposite directions of winding with respect to each other when both are viewed from the same side of said first and second planes of said at least one dielectric layer, said corresponding portions of said mutually opposing first and second flat conductor strips being spaced from each other by said at least one dielectric layer thereby capacitively engaging each other to a maximum extent, said mutually opposing flat conductor strip portions spaced one from each other by said at least one dielectic layer thus cooperating to form an individual LC stripline portion having a distributed line capacitance and a distributed line inductance, said generally aligned opposition of said first and second conductive spiral patterns providing an aligned overlay of said first and second flat conductor strips thus representing the summation of individual LC stripline portions cooperating to form an LC stripline circuit, said cooperation of individual LC stripline portions to form said LC stripline circuit being realized by a cascadingly stacked arrangement of a plurality of individual LC stripline portions exhibiting distributed line capacitances summing to an overall effective capacitance, distributed line inductances summing to an effective inductance and distributed mutual magnetic coupling factors between any two of said individual LC stripline portions, said cascadingly stacked arrangement of said plurality of individual an LC stripline portions being of the plane, concentric type and providing LC stripline circuit construction exhibiting a series of radially enlarging, individual closed LC stripline loops consisting of flat conductor strip portions of respective individual turns of said first and second conductive multiple-turn spiral pattern and said at least one dielectric layer spaced between, said LC stripline circuit construction thus enabling the entire surface of any first sides of said first and second flat conductor strips to react capacitively, thus yielding substantially 50% of all surfaces of said first and second flat conductor strips capacitively engaged, said overall effective capacitance and said overall effective inductance and said distributed mutual magnetic coupling factors causing said LC stripline circuit construction to resonate, said low metallized share of the area covered by the entire construction causing a high resonant Q, said LC stripline circuit construction thus representing a substantially planar resonant circuit, said substantially planar resonant circuit being covered by a suitable cover material to form said tag-like strip.
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19. Method for producing a plurality of individual identification devices in the form of a tag-like strip, each identification device having at least one self-contained and substantially planar resonant circuit which is integrally formed by both inductively and capacitively reacting elements exhibiting distributed inductances and distributed capacitances to engage in a mulit-loop LC stripline circuit construction, comprising the steps of:
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providing an electrically insulating, continuous sheet, having first and second sides, providing at least said first side of said continuous sheet with a surface capable of being activated to sealantly adhere to a metal and to a dielectric and to itself under the influence of pressure and heat, repetitively printing said second side of said continuous sheet in a format corresponding to the desired repetition of finished tag-like strips, repetitively providing said continuous sheet with a geometrically precise pattern consisting of a first and a second component, said first component being a metalized pattern defining electrically conductive paths, said conductive paths having first and second sides, one side thereof being adhered to said sealantly activatable surface of said first side of said continuous sheet under the influence of pressure and heat, said second component having a non-metalized pattern which is made up by at least one line of perforation cuts penetrating at least said continuous sheet and being arranged relative to said electrically conductive paths along the sheet, continuously folding said continuous sheet along said at least one line of perforation cuts, so that any segments of said metalized pattern representing components of LC stripline portions respectively meet in an aligned manner, continuously sealing the folded continuous sheet under the influence of pressure and heat by at least sealing said sealantly activatable surface of said first side of said continuous sheet, thereby fixing opposing parts of said metalized pattern in precise superposition, providing said folded and sealed continuous sheet at least with one transverse line of perforation cuts between any two adjacent resonant circuits, winding up said folded and sealed and repetitively transversely perforated sheet to form a continuing strip comprised of a plurality of individual identification devices having the form of a tag-like strip when disposed thereof. - View Dependent Claims (20, 21, 22)
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23. Method of producing a plurality of individual identification devices in the form of a tag-like strip, each identification device having at least one self-contained and substantially planar resonant circuit which is integrally formed by both inductively and capacitively reacting elements exhibiting distributed inductances and distributed capacitances to engage in a multi-loop LC stripline circuit construction, comprising the steps of:
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providing an electrically insulating, flexible continuous sheet of defined dielectric properties and thickness, said sheet having first and second sides, providing at least said first side of said continuous sheet with a surface capable of being activated to sealantly adhere to a metal under the influence of pressure and heat, providing at least said second side of said continuous sheet with a surface capable of being activated to sealantly adhere to itself, repetitively providing said continuous sheet with a geometrically precise pattern consisting of a first and second component, said first component being a metalized pattern made from a metal and defining elctrically conductive paths, said conductive paths having first and second sides, the first sides thereof being adhered to said sealantly activatable surface of said first side of said continuous sheet under the influence of pressure and heat, said second component being a non-metalized pattern which is made up by at least one line of perforation cuts penetrating at least said continuous sheet and being arranged in relation to said electrically conductive paths, continuously folding said continuous sheet along said at least one line of perforation cuts so that any parts of said metalized pattern representing components of LC stripline portions respectively meet in opposed alignment spaced by the double layer of said continuous sheet, continuously sealing the folded continuous sheet under the influence of pressure and heat, thereby fixing opposing parts of said metalized pattern in precise superposition, providing said folded and sealed continuous sheet with one transverse line of perforation cuts between any two resulting resonant circuits, winding up said folded and sealed and repetitively transversely perforated sheet to form a strip of a plurality of individual identification devices having the form of a tag-like strip. - View Dependent Claims (24, 25, 26)
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- 27. An identification device in the form of a tag-like strip affixable to an article and comprising at least one inductive member formed of flat conductor strips and a capacitive member formed of superposed conductor strip portions and an interposed dielectric, and forming with the inductive member a closed resonant circuit, said conductor strips being arranged on at least two areas formed by folding of the tag-like strip and being opposed to each other, those conductor strips which have larger dimensions being arranged electrically interconnected and having a continous configuration that can be developed into a single plane.
Specification