RFID tags having improved read range
First Claim
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1. An identification system, adapted to transmit identifying information about an article via radio frequency, comprising:
- an RFID tag, adapted to transmit said identifying information via radio frequency when energized; and
a layer having first and second opposite surfaces, wherein said first surface is adapted to be in contact with said article, said second surface is in contact with said RFID tag;
said layer having a thickness of less than 0.1 inches and a permeability of less than 10.
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Abstract
The present invention provides a system and method for optimizing the performance of 13.56 MHz frequency RFID tags in conjunction with metal substrates. Briefly, a thickness exists for each type of RFID isolator material at which the performance of a 13.56 MHz RFID tag is optimal when used with metal. Varying from this optimal value, in either the positive or negative direction adversely affects read distance. A method of determining this optimal thickness is disclosed, as well as an RFID tag or a substrate being used in conjunction with a material of this thickness.
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Citations
28 Claims
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1. An identification system, adapted to transmit identifying information about an article via radio frequency, comprising:
an RFID tag, adapted to transmit said identifying information via radio frequency when energized; and
a layer having first and second opposite surfaces, wherein said first surface is adapted to be in contact with said article, said second surface is in contact with said RFID tag;
said layer having a thickness of less than 0.1 inches and a permeability of less than 10.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An identification system, adapted to transmit identifying information about an article via radio frequency, comprising:
an RFID tag, adapted to transmit said identifying information via radio frequency when energized; and
a layer having first and second opposite surfaces, wherein said first surface is adapted to be in contact with said article, said second surface is in contact with said RFID tag;
said layer comprising ferromagnetic material having a permeability greater than 1 and less than 10 and a thickness, wherein said thickness, in mils, multiplied by said permeability is between about 170 and 450.- View Dependent Claims (10, 11, 12, 13, 14)
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15. An identification system, adapted to transmit identifying information about an article via radio frequency, comprising:
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a substrate comprising an antenna and a silicon chip mounted thereon, adapted to transmit said identifying information via radio frequency when energized; and a layer having first and second opposite surfaces, wherein said first surface is adapted to be in contact with said article, said second surface is in contact with said substrate;
said layer having a thickness of less than 1 inches and a permeability of less than 10. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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16. The system of 15, wherein said identification system utilizes radio frequency at 13.56 MHz.
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23. An identification system, adapted to transmit identifying information about an article via radio frequency, comprising:
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a substrate comprising an antenna and a silicon chip mounted thereon, adapted to transmit said identifying information via radio frequency when energized; and a layer having first and second opposite surfaces, wherein said first surface is adapted to be in contact with said article, said second surface is in contact with said substrate;
said layer comprising ferromagnetic material having a permeability greater than 1 and less than 10 and a thickness, wherein said thickness, in mils, multiplied by said permeability is between about 170 and 450. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification