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;
said RFID tag and said article defining a space therebetween, andsaid space comprising a layer having a thickness of less than 0.1 inches and wherein said layer comprises ferromagnetic material having a permeability 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
36 Claims
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1. An identification system, adapted to transmit identifying information about an article via radio frequency, comprising:
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an RFID tag, adapted to transmit said identifying information via radio frequency when energized;
said RFID tag and said article defining a space therebetween, andsaid space comprising a layer having a thickness of less than 0.1 inches and wherein said layer comprises ferromagnetic material having a permeability less than 10. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An identification system, adapted to transmit identifying information about an article via radio frequency, comprising:
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an RFID tag, adapted to transmit said identifying information via radio frequency when energized;
said RFID tag and said article defining a space therebetween, andsaid space comprising a 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 (12, 13, 14, 15, 16, 17, 18)
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19. 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;
said substrate and said article defining a space therebetween, andsaid space comprising a layer having a thickness of less than 0.1 inches and wherein said layer comprises ferromagnetic material having a permeability less than 10. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. 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;
said substrate and said article defining a space therebetween, andsaid space comprising a 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 (30, 31, 32, 33, 34, 35, 36)
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Specification