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Switchable radiation enhancement and decoupling

A state and dielectric technology, applied in the field of use of switchable devices, can solve problems such as refund or reactivation product information is complicated, and chip changes cannot be found

Inactive Publication Date: 2009-12-16
OMNI ID LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several disadvantages to this approach: First, if the tag is permanently non-functional, it would be too complicated to refund or reactivate the tag at the store to look up product information
Additionally, the user may not be able to detect changes within the chip

Method used

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  • Switchable radiation enhancement and decoupling
  • Switchable radiation enhancement and decoupling
  • Switchable radiation enhancement and decoupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0089] figure 1 A tag is shown with a low-Q antenna (small area antenna) 106 mounted on a single island-shaped decoupler comprising a first conductive layer 101 (tuned conductive layer) with a void area 107, which The void area 107 is located at the end of the first conductive layer 101 . A dielectric layer 102 is interposed between the first conductive layer 101 and the second conductive layer 103 . The length A of the first conductive layer will determine the frequency of the decoupler (for a particular dielectric layer - material and thickness, and to a lesser extent conductive layer) and is chosen to match the frequency of a particular read device.

[0090] This decoupler contains a structural weakness or perforation 104 extending through all three layers, which will allow the length of the decoupler to be reduced such that the tuning length of the decoupler is reduced to length B, This creates a mismatch between the decoupler and reader which, when sufficiently large, n...

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PUM

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Abstract

A device capable of enhancing an electric field to drive an electromagnetic tag into operation is switchable between states to control operation of the tag. Enhancement is provided by a dielectric cavity structure defined between first and second conducting layers. Different states of the device may have different resonant frequencies and read ranges according to the characteristics of the enhancement. As such a container can be provided which includes a tag which switches states on opening, allowing improved tracking characteristics.

Description

technical field [0001] The present invention relates to localized manipulation of electromagnetic fields and in particular but not limited to the use of switchable devices to allow RF (Radio Frequency) tags to be mounted near metal surfaces and activated or deactivated as required. Background technique [0002] Electronic devices that can interact with incident electromagnetic radiation and emit signals that can be detected by suitable readers are widely used in the identification and tracking of products, especially for items in a store or warehouse environment. Such devices, referred to throughout this specification as EM tags or RFID tags, or simply tags, typically include a chip coupled to an integral antenna tuned to a specific operating frequency. Existing EM tags typically operate at radio frequency (RF), including ultra high frequency (UHF) and microwave ranges, but the present invention is applicable to tags operating at any frequency. Tags can be passive or active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/22G06K19/077H01P7/06H01Q5/10
CPCG06K19/0726H01Q1/2225G06K19/07749G06K19/07771
Inventor 丹尼尔·罗伯特·约翰逊P·R·克拉克C·R·劳伦斯J·R·布朗W·N·达姆雷尔理查德·詹姆斯·邓库姆
Owner OMNI ID LTD