Electronic article surveillance (EAS) tag/device with coplanar and/or multiple coil circuits, an EAS tag/device with two or more memory bits, and methods for tuning the resonant frequency of an RLC EAS tag/device
First Claim
1. A surveillance and/or identification device, comprising:
- a) an outer inductor having a first end coupled to a first plate of a first capacitor;
b) an inner inductor having a first end coupled to a first plate of a second capacitor;
c) a dielectric film on said outer inductor, said inner inductor, said first plate of said first capacitor and said first plate of said second capacitor, the first dielectric film having openings therein exposing second ends of each of the outer and inner inductors;
d) a second plate of the first capacitor on the dielectric film, capacitively coupled to the first plate of the first capacitor;
e) a second plate of the second capacitor on the dielectric film, capacitively coupled to the first plate of the second capacitor;
f) a first conducting strap, configured to electrically connect a second end of the outer inductor to the second plate of the first capacitor; and
g) a second conducting strap, configured to electrically connect a second end of the inner inductor to the second plate of the second capacitor.
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Accused Products
Abstract
An EAS device, and methods for making the device for tuning the resonant frequency of the same is disclosed. The EAS device includes: an outer inductor having one end coupled to a linear or nonlinear capacitor plate; an inner inductor having one end coupled to the other type of capacitor; a first dielectric film on the outer and inner inductors and the capacitor plates coupled thereto, having openings exposing other ends of the outer and inner inductors; a second linear capacitor plate on the dielectric film; a second nonlinear capacitor plate on the dielectric film; a second dielectric film containing holes for the second linear and nonlinear capacitor plates, and exposing the other ends of the first and second inductors; and first and second conducting straps on the second dielectric film, configured to electrically connect one of the exposed inductor ends to a corresponding second capacitor plate.
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Citations
25 Claims
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1. A surveillance and/or identification device, comprising:
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a) an outer inductor having a first end coupled to a first plate of a first capacitor; b) an inner inductor having a first end coupled to a first plate of a second capacitor; c) a dielectric film on said outer inductor, said inner inductor, said first plate of said first capacitor and said first plate of said second capacitor, the first dielectric film having openings therein exposing second ends of each of the outer and inner inductors; d) a second plate of the first capacitor on the dielectric film, capacitively coupled to the first plate of the first capacitor; e) a second plate of the second capacitor on the dielectric film, capacitively coupled to the first plate of the second capacitor; f) a first conducting strap, configured to electrically connect a second end of the outer inductor to the second plate of the first capacitor; and g) a second conducting strap, configured to electrically connect a second end of the inner inductor to the second plate of the second capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17)
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9. A method for making a surveillance and/or identification device, comprising the steps of:
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a) forming a semiconductor component on a first dielectric film, said first dielectric film being on an electrically functional substrate; b) forming a second dielectric film on the first dielectric film and the semiconducting component, the second dielectric film having holes therein to facilitate electrical connection to the semiconductor component and the substrate; c) forming a plurality of conductive structures, a first one of which is at least partly on said semiconductor component and which comprises a first electrically conducting strap configured to provide electrical communication between said semiconductor component and said electrically functional substrate, and a second one of which comprises a second electrically conducting strap configured to provide electrical communication between a linear capacitor plate and the electrically functional substrate; and d) etching said electrically functional substrate to form an inner inductor and an outer inductor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 22, 23)
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16. A method for making a surveillance and/or identification device from an electrically functional substrate having a first dielectric film thereon, comprising the steps of:
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a) forming a second dielectric film on the first dielectric film, the second dielectric film having holes therein to facilitate formation of structures electrically connected and/or capacitively coupled to the electrically functional substrate; b) forming a semiconductor component in at least one of said holes; c) forming a plurality of conductive structures, a first one of which is at least partly on said semiconductor component and which comprises a first electrically conducting strap configured to provide electrical communication between said semiconductor component and said electrically functional substrate, and a second one of which comprises a second electrically conducting strap configured to provide electrical communication between a linear capacitor plate and the electrically functional substrate; and d) etching said electrically functional substrate to form an inner inductor and an outer inductor. - View Dependent Claims (24, 25)
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18. An electronic article surveillance device, comprising:
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a) a first inner circuit having a first inductor coupled to a first capacitor, said first inner circuit being configured to resonate at a first frequency, said first inner circuit configured to be deactivated at an integer multiple of said first frequency; b) a second inner circuit having a second inductor coupled to a second capacitor, said second inner circuit being configured to resonate at a second frequency, said second inner circuit configured to be deactivated at an integer multiple of said second resonant frequency; and c) an outer circuit having a third inductor coupled to a third capacitor, said third inductor surrounding and substantially coplanar with said first and second circuits. - View Dependent Claims (19, 20)
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21. A method of tuning an electronic article surveillance device, comprising:
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a) forming a conductive structure configured to provide electrical communication between a capacitor plate of said device and an electrically functional substrate; and b) etching said electrically functional substrate to form an inductor and an electromagnetically active inner plug or ring, said inner plug or ring having dimensions and/or a location sufficient to shift a resonant frequency of the inductor relative to locating said inner plug or ring in the geometric center of the outer inductor.
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Specification