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Radiation enhancement and decoupling

A dielectric and component technology, applied in the field of local control of electromagnetic fields, can solve problems such as damage, accidental impact, and impractical spacers

Inactive Publication Date: 2009-12-02
OMNI ID LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Clearly, a spacer of this thickness is not practical for many applications and is prone to accidental impact and damage

Method used

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  • Radiation enhancement and decoupling
  • Radiation enhancement and decoupling
  • Radiation enhancement and decoupling

Examples

Experimental program
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Effect test

Embodiment Construction

[0051] Figure 1a A cross-section of a quarter-wave element with a dielectric cavity formed on two layers is shown. The layers are defined between the conductive plates 102 , 104 and 106 , with the bottom dielectric layer 110 between the conductive plates 102 and 104 and the upper dielectric layer 112 between the conductive plates 104 and 106 . At the left-hand end of the illustrated decoupler, conductive plates 102 and 106 extend beyond plate 104 and are electrically connected by end wall 116 . This arrangement allows the two dielectric layers to join at this end.

[0052] Viewed into the paper, the structure is uniform across its width with the dielectric and conductive plates exposed at the sides of the structure.

[0053] The path length 120 is an approximation of the effective length of the cavity for the radiation wavelength that forms a standing wave within the cavity. exist Figure 1a In , it is shown formed by three straight sections joined at right angles into a "C...

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Abstract

Apparatus capable of enhancing an incident electric field to drive an electromagnetic tag (124) into operation, comprising a resonant dielectric cavity which extends out of a single plane defined between two conducting surfaces (102, 104, 106). The cavity may extend over two or more layers, and can adopt C or S shaped or spiral profiles.

Description

technical field [0001] The present invention relates to the localized control of electromagnetic fields, and more particularly, but not limited to, the use of radiation control devices that allow RF (Radio Frequency) tags to be mounted on materials that would interfere with RF tags if such radiation control devices were not used usage of. Background technique [0002] RF tags are widely used for the identification and tracking of products, especially items in a store or warehouse environment. As a general rule of thumb, one disadvantage of such tags is that if the tag is placed directly on a metal surface, the read range of the tag drops to unacceptable levels and more typically the tag cannot be read or interrogated (interrogate). This is because propagating wave RF tags utilize an integrated antenna to receive incident radiation: the size and geometry of the antenna specifies at which frequency the antenna resonates, and thus the operating frequency of the tag (typically...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/22H01P7/06G06K19/077
CPCH01Q1/2225H01P7/00
Inventor J·R·布朗C·R·劳伦斯W·N·达姆雷尔
Owner OMNI ID LTD
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