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US 8,618,995 B2Granted
Metal pipe managed by wireless tag and wireless tag
AssigneeFujitsu Limited
InventorsTakashi Yamagajo, Toru Maniwa, Manabu Kai
Life of this patent
Estimating the term…
Abstract
A metal pipe includes a slot having a predetermined length in a longitudinal direction of the metal pipe and a wireless tag that is placed inside the metal pipe and includes a power feeding unit to feed electric power to the slot and an IC chip connected to the power feeding unit, thereby functioning as an antenna of the wireless tag. The metal pipe is thus managed by the wireless tag.
Claims10
A wireless tag, comprising:
- a power feeding unit to feed electric power in order for a metal pipe to function as an antenna, the power feeding unit being placed inside the metal pipe that is formed with a slot having a predetermined length in a longitudinal direction, and including conductor pattern taking an arc shape along an inner periphery of the metal pipe, the conductor pattern being isolated from the metal pipe and for feeding the electric power to the metal pipe through electromagnetic coupling;
- an IC (Integrated Circuit) chip, which is placed inside the metal pipe and is connected to the power feeding unit, to allow monitoring of position of the metal pipe that is a construction material;
- and
- a matching unit including a looped conductor pattern formed in parallel with a plane orthogonal to the longitudinal direction and connected to the IC chip in parallel with the looped conductor pattern, the matching unit to take impedance matching between the metal pipe and the IC chip, wherein the frequency of the electric power is lower than the cutoff frequency of the metal pipe.
1 more element
A metal pipe, comprising:
- a slot having a predetermined length in a longitudinal direction of the metal pipe;
- and
- a wireless tag to allow monitoring of position of the metal pipe that is a construction material,
- wherein the wireless tag is placed inside the metal pipe and includes a power feeding unit to feed electric power to the slot in order for the metal pipe to function as an antenna and an IC (Integrated Circuit) chip connected to the power feeding unit, the power feeding unit including conductor pattern taking an arc shape along an inner periphery of the metal pipe, the conductor pattern being isolated from the metal pipe and for feeding the electric power to the metal pipe through electromagnetic coupling,
- wherein the wireless tag further includes a matching unit including a looped conductor pattern formed in parallel with a plane orthogonal to the longitudinal direction and connected to the IC chip in parallel with the looped conductor pattern, the matching unit to take impedance matching between the metal pipe and the IC chip, wherein the frequency of the electric power is lower than the cutoff frequency of the metal pipe.
2 more elements
Dependencies are inferred from the claim text.