Radio frequency tag
AssigneeCanon Kabushiki Kaisha
InventorsTadahiko Hirai, Takayuki Sumida
Life of this patent
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Abstract
The present invention provides an RF tag which does not have an integrated circuit such as a silicon chip, can retain a plurality of information, can rewrite or add the information, and is inexpensive. The RF tag includes an RF resonance circuit which has at least two capacitors connected in series or parallel and at least one coil antenna formed on a substrate, wherein at least one of the capacitors is an anti-fuse which irreversibly short-circuits when a voltage higher than a threshold voltage is applied to the anti-fuse, and the surface of an electrode constituting the capacitor has a mean roughness of 1 μm or less.
Claims15
A radio frequency tag comprising a radio frequency resonance circuit which has at least two capacitors connected in series or parallel and at least one coil antenna formed on a substrate made of a material including at least one selected from the group consisting of a resin, a glass, a paper and a metal, and which is resonated by electromagnetic induction, wherein the at least two capacitors and the at least one coil antenna are all arranged on one side of the substrate.
An radio frequency tag comprising a radio frequency resonance circuit which has at least one capacitor and at least one coil antenna formed on a substrate made of a material including at least one selected from the group consisting of a resin, a glass, a paper and a metal, and which is resonated by electromagnetic induction, wherein two or more sets of the radio frequency resonance circuits are arranged on the same and one substrate, each of the sets has a different resonance frequency, and the capacitors and coil antennas in the two or more sets of the radio frequency resonance circuits are all arranged on one side of the substrate.
Dependencies are inferred from the claim text.