Improved RFID tags

A technology of RFID tags and dielectric constants, applied to record carriers used by machines, alarms and instruments that rely on mobile portable items, etc., can solve problems such as unsuccessful and few

Inactive Publication Date: 2007-09-12
EMERSON & CUMING MICROWAVE PRODS
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  • Abstract
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  • Claims
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Problems solved by technology

However, homogeneous materials with various values ​​of k have been tried with little or no success

Method used

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Examples

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Embodiment Construction

[0027] Passive UHF RFID tag antenna optimized for use in free space or on low dielectric materials such as corrugated cardboard, shelf wood, etc. When the UHF RFID tag is close to the metal substrate, the impedance of the tag antenna changes. For effective power transfer of the wave energy emitted by the RFID reader to the tag's IC circuit, the antenna must provide a smooth impedance transformation from free space to the IC circuit impedance. Antenna design typically assumes that the substrate to which the antenna will be in close proximity has a permeability equal to 1. In a substrate with a magnetic permeability not equal to 1, the parasitic inductance in the insulator material can be used to offset the parasitic capacitance of the metal substrate, thereby facilitating tag isolation. Alternatively, at least two materials with distinct dielectric constants may be used to better isolate the tag from the metal substrate.

[0028] Fig. 6 shows a first embodiment of the inventi...

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Abstract

A system and method for the use of ultra high frequency RFID tags in conjunction with metal substrates, as well as substrates used to contain liquid. Briefly, an RFID isolator comprised of a material with complex magnetic permeability, used either by itself, or in combination with dielectric isolator material, is interposed between the RFID tag and the substrate. Alternatively, a material possessing at least two distinct dielectric constants is interposed between the' RFID tag and the substrate, such that there is a high dielectric constant at the interface with the substrate, and a low dielectric constant at the interface with the RFID tag. This material can be a single material having a dielectric constant gradient, or alternatively, two or more separate layers, each with a uniform but different dielectric constant, sandwiched together.

Description

[0001] This application claims priority to US Provisional Application No. 60 / 615,826, filed October 4, 2004, and US Provisional Application No. 60 / 713,861, filed September 2, 2005, the contents of which are incorporated herein by reference. Background technique [0002] Radio frequency identifier (RFID) tags are used in a variety of applications, such as inventory control and security. The advantage of these smarter RFID systems, unlike bar code tracking systems, is that RFID systems can store specific information about an item and can read that information on the tag without requiring a line of sight or specific orientation. This means that RFID systems can be largely automated, reducing the need for manual scanning. [0003] These RFID tags are typically placed in or on items or containers such as cardboard boxes. RFID tags work in conjunction with RFID base stations. The base station provides electromagnetic wave output, which acts as a carrier frequency. The data is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B13/14
CPCG06K19/07749G06K19/07771
Inventor P·F·迪克松M·P·卡彭特M·M·奥斯沃德D·A·吉布斯
Owner EMERSON & CUMING MICROWAVE PRODS
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