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Electromagnetic radiation decoupler

A decoupler, electronic device technology, applied in the field of electromagnetic radiation isolation or attenuation devices, can solve the problems of increasing cost and complexity, complex antenna design, etc.

Inactive Publication Date: 2008-08-20
OMNI ID LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution does not require large spacers, but requires a relatively complex antenna design that must be impedance matched and thus different for each tag, thus increasing the cost and complexity of manufacturing

Method used

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Examples

Experimental program
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Effect test

example 1

[0210]Adopt non-conductive catalyst ink (provided by Sun Chemical, product name is QS1, QS2 or DP1607, as disclosed in application GB 0422386.3) will decoupling unit, promptly first and second conductor layer screen print (double-sided) to on a polymer (forming the dielectric core) with known electrical properties. The dimensions of the UHF decoupler depend on the electrical properties and thickness of the polymer. For example, using Quinn plastic, Spectar-grade PETG sheets with a thickness of 1 mm, a relative permittivity of 3.2, results in a decoupler period of 95 mm and a minimum decoupler length of 190 mm (using island length ≈λ / (2√ (dielectric constant), wherein the refractive index is approximately equal to the root of the dielectric constant). The decoupler pattern is printed on the front side of the polymer, that is, by two orthogonal Four equal-sized islands separated by lines. Print the reverse side of the decoupler as a solid area.

[0211] The ink was cured by he...

example 2

[0214] Decoupling cells (both sides) are screen printed onto polymers with known electrical properties using conductive inks, eg, Acheson Electrodag PR401B Carbon ink or Acheson Electrodag 503 Silver ink. The dimensions of the UHF decoupler depend on the electrical properties and thickness of the polymer. For example, using Quinn plastic, Spectar-grade PETG sheet with a thickness of 1 mm, has a relative permittivity of 3.2, resulting in a decoupler period of 95 mm and a minimum decoupler length of 190 mm. The polymer was printed on the front side in a decoupler pattern and the back side was printed as a solid area.

[0215] The ink was cured (for Acheson Electrodag PR401B Carbon ink and Acheson Electrodag 503 Silver ink) by heating the sample, which allowed the ink to solidify and adhere to the substrate.

[0216] Afterwards, the resulting product was laminated with a functional spacer and mounted on a decoupler in the same manner as defined in Example 1.

example 3

[0218] An etch resist (eg, Sun Chemical XV 750) is screen printed onto the metal surface using a polymer film (eg, DuPont Mylar PET film) covering the metal. Once dry, the etch resist adheres to the surface of the metal in a pattern of decouplers. Afterwards, the film is placed in a caustic solution (e.g., in MAX ETCH from Old Bridge Chemicals). TM within 20R). This process removes uncovered metal areas, leaving only the non-conductive substrate. Afterwards, the metallized patterned film is laminated onto the core material and sandwiched by another metallized non-patterned film used as a backplane. Afterwards, it requires spacer lamination and labeling as defined in Example 1 and Example 2.

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Abstract

The invention relates to an electromagnetic radiation decoupler for decoupling radiation in the wavelength range lamda min to lamda max. The decoupler has a first conductor layer in contact with a dielectric layer which comprises at least one area of absence and the thickness of the decoupler is less than lamda min / 4n, where n is the refractive index of the dielectric. The dielectric layer may be sandwiched between two conductor layers, one of which has the structure described above. The invention is also directed to methods of using and various articles comprising such a decoupler.

Description

technical field [0001] The present invention relates to the field of electromagnetic radiation isolation or attenuation devices, and more particularly to the field of coupling energy into RF (Radio Frequency) tags. The present invention allows decoupling (ie, isolation) of RF tags from surfaces that degrade tag performance, such as metal surfaces. The present invention pertains to any RF tag, especially one that relies on propagating wave interactions (as opposed to the inductive coupling exhibited by magnetic tags), and thus our preferred embodiments relate to long-range system tags (e.g., UHF range and microwave range label) application. Background technique [0002] RF tags are widely used in the identification and tracking of items, especially the identification and tracking of items in a store or warehouse environment. A disadvantage commonly encountered with such tags is that if placed directly on (or within a few millimeters of) a metal surface, the read range of sa...

Claims

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Application Information

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IPC IPC(8): G06K19/07G06K19/077
Inventor J·R·布朗C·R·劳伦斯P·R·克拉克W·N·达姆雷尔
Owner OMNI ID LTD
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