METAL OXIDE SEMICONDUCTOR DEVICE FOR USE IN UHF ELECTRONIC ARTICLE SURVEILLANCE SYSTEMS
First Claim
Patent Images
1. An electronic article surveillance (“
- EAS”
) tag comprising;
an antenna circuit; and
a non-linear component electrically coupled to the antenna circuit, the non-linear component exhibiting a non-linear capacitance with respect to voltage below a breakdown voltage threshold and exhibiting irreversible linear capacitance with respect to voltage above the breakdown voltage threshold.
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Abstract
An Electronic Article Surveillance (“EAS”) tag and method and system for deactivating EAS tags without the need to physically contact the tag with a deactivation device. The EAS tag replaces the conventional diode with a non-linear device such as a metal-oxide-semiconductor (“MOS”) capacitor with a given breakdown voltage threshold. Inducing a predetermined voltage across the MOS capacitor results in destruction of the MOS capacitor rendering the EAS tag undetectable in the EAS interrogation system.
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Citations
20 Claims
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1. An electronic article surveillance (“
- EAS”
) tag comprising;an antenna circuit; and a non-linear component electrically coupled to the antenna circuit, the non-linear component exhibiting a non-linear capacitance with respect to voltage below a breakdown voltage threshold and exhibiting irreversible linear capacitance with respect to voltage above the breakdown voltage threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- EAS”
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10. An electronic article surveillance (“
- EAS”
) tag deactivation system comprising;an EAS tag, the tag comprising; an antenna circuit; and a non-linear component electrically coupled to the antenna circuit, the non-linear component exhibiting a non-linear capacitance with respect to voltage below a breakdown voltage threshold and exhibiting irreversible linear capacitance with respect to voltage above the breakdown voltage threshold; and a deactivation device adapted to deactivate the EAS tag without making contact with it. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- EAS”
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19. A method of deactivating an electronic article surveillance (“
- EAS”
) tag, the method comprising;providing an EAS tag having an antenna circuit and a non-linear component electrically coupled to the antenna circuit, the non-linear component exhibiting a non-linear capacitance with respect to voltage below a breakdown voltage threshold and exhibiting irreversible linear capacitance with respect to voltage above the breakdown voltage threshold; and inducing a voltage across the non-linear component, the induced voltage being greater than the breakdown threshold in order to breakdown the non-linear component. - View Dependent Claims (20)
- EAS”
Specification