Tyre comprising radio frequency transponder

Abstract

The invention relates to a tyre comprising a transponder, said tyre having:-a crown comprising a crown reinforcement having an axial end at each edge, at each axial end thereof, connected by a sidewall to a bead having an inner end; -a carcass reinforcement layer made up of parallel metal reinforcements anchored in each bead around the bead core, thereby forming a main portion and a bead; -said transponder comprising a dipole antenna consisting of a spring defining a pitch P and a diameter D, the length of said spring defining a longitudinal axis, characterized in that the ratio between the pitch (P1) and the diameter (D1) of the annular loop of the first region of the spring is greater than 0.8, and in that the length of the annular loop of the second region of the spring is greater than 0.8. And the transponder is positioned axially outward with respect to the inner end of the bead and radially between the upper end of the bead core and the axial end of the crown reinforcement.

Description

technical field [0001] The invention relates to tire casings equipped with electronic radio identification devices or radio frequency transponders, which tire casings are subjected to severe thermomechanical stresses, in particular when used mounted on land vehicles. Background technique [0002] In the field of RFID (RFID is an acronym for Radio Frequency Identification) devices, passive radio frequency transponders are commonly used to identify, track and manage objects. These devices allow for more reliable and faster automated management. [0003] These passive RFID transponders generally consist of at least one electronic chip and an antenna formed by a magnetic loop or a radiating antenna, which are fixed to the object to be identified. [0004] For a given signal transmitted to or by an RF reader, the communication performance of an RF transponder is expressed as the maximum communication distance between the RF transponder and the RF reader. [0005] In the case of...

AI Technical Summary

Problems solved by technology

[0007] However, such passive radio frequency transponders present disadvantages in their use when incorporated into tire casings, especially when the carcass reinforcement of the tire casing is made of metal

Although this RF transponder is suitable for operation at the communication frequency of an external RF reader, RF communication via a radiating antenna is not optimal, especially for remote interrogation, especially since metal reinforcements can interfere with radio waves

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