RFID Label With Shielding Element
AssigneeIdentive Group, Inc.
InventorStefan Mieslinger
Life of this patent
Estimating the term…
Abstract
Described are RFID structures and methods for forming RFID structures. An RFID structure includes a loop antenna assembly, an antenna substrate supporting the loop antenna assembly, and a shielding layer parallel with a plane defined by the antenna substrate. The loop antenna assembly has a stand-alone resonant frequency of ƒ1 above or below a standardized reader frequency range. The loop antenna includes an antenna track and at least two contact pads. The loop antenna assembly in combination with the shielding layer has a resonant frequency of ƒ2 below the standardized reader frequency range. If positioned against a metallic surface, the loop antenna assembly in combination with the shielding layer has a resonant frequency within the standardized reader frequency range.
Claims31
A RFID structure comprising:
- a loop antenna assembly having a stand-alone resonant frequency of ƒ1 above or below a standardized reader frequency range, the loop antenna including an antenna track, and at least two contact pads;
- an antenna substrate supporting the loop antenna assembly;
- and
- a shielding layer parallel with a plane defined by the antenna substrate, the loop antenna assembly in combination with the shielding layer having a resonant frequency of ƒ2 below the standardized reader frequency range,
- wherein, if positioned against a metallic surface, the loop antenna assembly in combination with the shielding layer has a resonant frequency within the standardized reader frequency range.
A method of manufacturing an RFID structure, the method comprising:
- providing an antenna substrate;
- forming, on the antenna substrate, a loop antenna assembly having a stand-alone resonant frequency of ƒ1 above or below a standardized reader frequency range, the loop antenna including an antenna track, and at least two contact pads;
- and
- providing a shielding layer parallel with a plane defined by the carrier foil, the loop antenna assembly in combination with the shielding layer having a resonant frequency of ƒ2 below the standardized reader frequency range,
- wherein, if positioned against a metallic surface, the loop antenna assembly in combination with the shielding layer has a resonant frequency within the standardized reader frequency range.
Dependencies are inferred from the claim text.