Tag device and method for electronic article surveillance
First Claim
1. In combination, in an elongate tag device for use in a surveillance system for receipt of and concurrent response to a first high frequency signal and a second lower frequency signal transmitted by such system, first and second circuit elements mutually separate, electrically series-connected and of respective different geometries for predominant receipt thereby of said first and second frequency transmitted signals, said first and second circuit elements further being mutually coactive along facing longitudinal extents thereof for enhancing such predominant signal receipts thereby.
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Accused Products
Abstract
A method is disclosed for effecting electronic article surveillance with a first high frequency signal and a second lower frequency signal, the second signal having a modulation characteristic therewith. Generally rectangular tag devices are attached to said articles for receipt of such signals and for reradiation thereof. The method involves the fabrication of the tag devices by the steps of: (a) providing first and second circuit elements to be of type exhibiting fixed inductive and capacitive reactances; (b) providing a third circuit element to be of type exhibiting voltage dependent capacitive reactance and forming an electrical series circuit of the first, second and third circuit elements; and (c) configuring the first and second circuit elements with respective geometric diversities, whereby the first circuit element extends longitudinally of the device and is of first transverse dimension, and whereby the second circuit element extends longitudinally of the device at least in part jointly spacedly with the first circuit element and is of second transverse dimension substantially exceeding the first transverse dimension, thus effecting predominant different receipt by the first and second circuit elements of the first and second frequency transmitted signals.
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Citations
19 Claims
- 1. In combination, in an elongate tag device for use in a surveillance system for receipt of and concurrent response to a first high frequency signal and a second lower frequency signal transmitted by such system, first and second circuit elements mutually separate, electrically series-connected and of respective different geometries for predominant receipt thereby of said first and second frequency transmitted signals, said first and second circuit elements further being mutually coactive along facing longitudinal extents thereof for enhancing such predominant signal receipts thereby.
- 13. A tag device for use in a surveillance system for receipt of and concurrent response to a first high frequency signal and a second lower frequency signal transmitted by such system, said tag device being of generally rectangular configuration and comprising a first circuit element extending longitudinally of said device and being of first transverse dimension, a second circuit element extending longitudinally of said device at least in part jointly with said first circuit element and being of second transverse dimension substantially exceeding said first transverse dimension and effecting predominant different receipt by said first and second circuit elements of said first and second frequency transmitted signals, and means for exhibiting voltage dependent capacitive reactance connected in electrical series circuit with said first and second circuit elements.
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17. A method for effecting electronic article surveillance with a system of a type having transmissions inclusive of a first high frequency signal and a second lower frequency signal, such second signal having a modulation characteristic therewith, and wherein generally rectangular tag devices are attached to said articles for receipt of said transmissions and for reradiation concurrently of said first and second signals thereof, said method comprising the fabrication of said tag devices by the steps of:
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(a) providing first and second circuit elements to be of a type exhibiting fixed inductive and capacitive reactances; (b) providing a third circuit element to be of type exhibiting voltage dependent capacitive reactance and forming an electrical series circuit with said first, second and third circuit elements; and (c) configuring said first and second circuit elements with respective geometric diversities, such that said second circuit element predominates in receipt of said second frequency transmitted signals over receipt thereby by said first circuit element, and such that said series circuit is resonant at said first frequency said step (b) being further practiced by selecting said third circuit element to coordinate the voltage dependent capacitive reactance thereof with said second frequency transmitted signals received by said second circuit element to enhance capacitive reactance change in said third circuit element in response to such signals received by said second circuit element.
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18. A method for effecting electronic article surveillance with a system of type having transmissions inclusive of a first high frequency signal and a second lower frequency signal, such second signal having a modulation characteristic therewith, and wherein generally rectangular tag devices are attached to said articles for receipt of said transmissions and for reradiation concurrently of said first and second signals thereof, said method comprising the fabrication of said tag devices by the steps of:
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(a) providing first and second circuit elements to be of type exhibiting fixed inductive and capacitive reactances; (b) providing a third circuit element to be of type exhibiting voltage dependent capacitive reactance and forming an electrical series circuit with said first, second and third circuit elements; and (c) configuring said first and second circuit elements with respective geometric diversities, whereby said first circuit element extends longitudinally of said device and is of first transverse dimension, and whereby said second circuit element extends longitudinally of said device at least in part jointly spacedly with said first circuit element and is of second transverse dimension substantially exceeding said first transverse dimension to effect predominant different receipt by said first and second circuit elements of said first and second frequency transmitted signals. - View Dependent Claims (19)
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Specification