RFID tags having improved read range
AssigneeEmerson & Cuming Microwave Products, Inc.
InventorsPaul Dixon, Michael Carpenter, Mary Osward, David Gibbs
Life of this patent
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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.
Claims36
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, and
- said space comprising a layer having a thickness of less than 0.1 inches.
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, and
- said space comprising a layer comprising ferromagnetic material having a permeability greater than 1 and a thickness, wherein said thickness, in mils, multiplied by said permeability is between about 170 and 450.
An identification system, adapted to transmit identifying information about an article via radio frequency, comprising:
- 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, and
- said space comprising a layer having a thickness of less than 0.1 inches.
An identification system, adapted to transmit identifying information about an article via radio frequency, comprising:
- 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, and
- said space comprising
- a layer comprising ferromagnetic material having a permeability greater than 1 and a thickness, wherein said thickness, in mils, multiplied by said permeability is between about 170 and 450.
Dependencies are inferred from the claim text.