On-metal uhf rfid tag
AssigneeCaptag Solutions Ltd.
InventorsDavid Bernard Mapleston, Brian Weeks, David Christopher Charles Potter, Linda Ann Mapleston
Life of this patent
Estimating the term…
Abstract
A low-cost long-range UHF on-metal RFID tag uses capacitive coupling means to enhance the range of its monopole antenna structure. Furthermore, the capacitive coupling can couple through a thin insulator directly to the metal surface being tagged or to an optional interposing metallic layer between the tag and metallic or non-metallic items being tagged. These tag embodiments require no dielectric or ferrite material which reduces the cost of the tag without compromising the read range.
Claims25
A long-range UHF RFID tag functional both on and off metal comprises:
- a chip comprising a transponder;
- an inverted-L monopole antenna structure;
- a resonant impedance matching structure attached to the antenna, which resonant impedance matching structure is in the form of an elongated resonant means;
- and
- a conductive interposer layer capacitively coupled to the inverted-L monopole antenna structure,
- wherein the resonant impedance matching structure is positioned partly over the interposer and wherein the resonant impedance matching structure is configured to provide frequency tuning of both the antenna and the resonant impedance matching structure to the transponder integrated circuit by moving its position, and optionally free from ferromagnetic and ceramic material.
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
Dependencies are inferred from the claim text.