Encodable tag with radio frequency readout
First Claim
Patent Images
1. A programmable tag, comprising:
- a first layer of magnetic material,a second layer of magnetic material, anda layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material,said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag,wherein said soft magnetic layer provides an alterable magnetic shunt for personalizing said bias field applied thereto at individual portions of said layer of resonant material.
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Abstract
A programmable tag for being readable remotely and in a manner which does not require that the tag be held in a particular orientation, includes a first layer of material with electron spin resonance absorption, a second layer of hard magnetic material, and a third layer of soft permeable magnetic material. The second layer and third layer are in close proximity to the first layer. The second layer and the third layer impose a magnetic bias field on the first layer.
96 Citations
23 Claims
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1. A programmable tag, comprising:
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a first layer of magnetic material, a second layer of magnetic material, and a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, wherein said soft magnetic layer provides an alterable magnetic shunt for personalizing said bias field applied thereto at individual portions of said layer of resonant material. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 14, 15, 16, 17)
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7. A programmable tag, comprising:
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a first layer of magnetic material, a second layer of magnetic material, a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, and further comprising a thermal barrier layer formed between said layer of soft magnetic material and the immediately adjacent layer or layers. wherein said soft magnetic layer provides an alterable magnetic shunt for personalizing said bias field applied thereto at individual portions of said layer of resonant material. - View Dependent Claims (11)
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18. A programmable tag, comprising:
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a first layer of magnetic material, a second layer of magnetic material, and a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, wherein said soft magnetic layer provides an alterable magnetic shunt for selectively shunting a portion of said magnetic bias field to achieve personalization of said bias field applied thereto at individual portions of said layer of resonant material.
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19. A programmable tag, comprising:
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a first layer of magnetic material, a second layer of magnetic material, and a layer of resonant material, said resonant material having an electron spin resonance absorption characteristic, wherein one of said first layer and said second layer comprises a hard magnetic material and the other of said first layer and said second layer comprises a soft magnetic material, said first layer and said second layer being in close proximity to said layer of resonant material, and said first layer and said second layer imposing a magnetic bias field on said layer of resonant material, said magnetic bias field being selectively altered to thereby program said tag, wherein said soft magnetic layer has a fixed, predetermined thickness, and a plurality of non-magnetic breaks therein for selectively modifying the permeability of said soft magnetic layer, said non-magnetic breaks selectively increasing the flux carrying capacity of said soft magnetic layer.
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20. A method of constructing an encodable tag, said method comprising steps of:
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dissolving 1,1 diphenyl-2-picrylhydrazyl hydrate (DPPH) in a solvent; coating a nonmagnetic substrate on a first side with dissolved DPPH; depositing a hard magnetic bias layer having square loop properties on a second side of said nonmagnetic substrate having said dissolved DPPH; depositing a nonmagnetic layer over said hard magnetic bias layer; and coating said nonmagnetic layer with a soft magnetic material to form said encodable tag. - View Dependent Claims (21, 22, 23)
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Specification