Low-Profile Antenna-less RFID Tags and Integrated Circuit Wireless Transmission Apparatus
AssigneeNDSU Research Foundation
InventorsCherish Bauer-Reich, Layne Albert Berge
Life of this patent
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Abstract
Disclosed embodiments include a low-profile, high-permeability antenna-less radio frequency identification (RFID) tag for use on large metal objects and other types of objects for which traditional RFID technologies will not work or do not work well. High-permeability materials are in contact with a metal surface, such as a metal container or metallic tape, diverting current into the tag integrated circuit (IC). This type of tag is essentially ‘antenna-less’ as it uses the ground plane or metallic object to excite currents through the IC. Tags using high-permeability materials in this manner are significantly thinner than those developed using other methods.
Claims15
An antenna-less circuit transmission apparatus, comprising:
- a metallic surface;
- a body, comprising
- a high-permeability material with a relative permeability greater than 1;
- and
- a dielectric material;
- wherein the dielectric material forms a thin coating on the high-permeability material, except for a first side of the high-permeability material, which is left uncoated;
- wherein the first side of high-permeability material is in direct contact with the metallic surface;
- a circuit located on a second side of the body and electrically isolated from the high-permeability material by the dielectric material;
- and
- electrical conductors forming an electrical contact between the circuit and the metallic surface, wherein the electrical conductors are isolated from the high-permeability material of the body by the dielectric material, and wherein the metallic surface functions as an antenna for the circuit.
An antenna-less transmission apparatus, comprising:
- a metallic surface;
- a body, comprising:
- a high-permeability material, having a relative permeability greater than 1, positioned in contact with the metallic surface;
- and
- a dielectric material forming a thin coating on the high-permeability material;
- first and second conductors formed on sides of the high-permeability material and electrically connected to the metallic surface to electrically connect a circuit to the metallic surface such that the metallic surface functions as an antenna for the circuit.
Dependencies are inferred from the claim text.