Tire having a radiofrequency transponder

A tire casing (100) in a shape of a torus about a reference axis, equipped with a passive radiofrequency transponder (1, 1bis) and comprising:

• a crown block (82) comprising a crown reinforcement (86) having an axial end (861) at each of its edges, and a tread (89), connected at each of its axial ends (821) to a bead (84) having an inner end (841) situated axially and radially on an inside of the bead (84) with respect to the reference axis, via a sidewall (83);
• first filaments going back and forth, in an adjacent arrangement and aligned circumferentially, anchored in the beads (84) with, in each bead (84), loops each connecting back and forth filaments, the first filaments forming at least a circumferential alignment defining a carcass reinforcement (87) separating the tire casing into two regions, inner and outer, with respect to the carcass reinforcement (87);
• in each bead (84), means for anchoring the first filaments, comprising second filaments oriented circumferentially axially bordering the first filaments, and forming at least one spiral (85, 88);
• a first layer of elastomer compound (91) forming an exterior surface of the tire casing (100) in a region of the bead (84), the first layer of elastomer compound (91) being intended to come into contact with a rim;
• a second layer of elastomer compound (92) situated radially on an outside in contact with the first layer of elastomer compound (91) forming an exterior surface of the sidewall (83);
• and
• the passive radiofrequency transponder (1, 1bis), comprising a main core (1012) defining a first longitudinal axis (1030), a first primary cover filament (1013a) wound in turns around the main core (1012) defining a winding diameter D and an electrical insulation device (1021, 1024, 1025, 2001, 2002), disposed radially on an outside of the first primary cover filament (1013a) with respect to the first longitudinal axis (1030),
• the first primary cover filament (1013a) comprising at least two conductive filamentary elements (1003a, 1003b), the diameter of which is between 0.05 and 0.15 millimeter, galvanically connected to at least one electronic chip (1002) comprising a radiofrequency transmission-reception component (1004), and
• the main core (1012) having a stiffness lower than a maximum stiffness of the first primary cover wire (1013a, 1013b),
• wherein the electrical insulation device (1021, 1024, 1025, 2001, 2002) has a mean relative dielectric permittivity less than or equal to 10 over a thickness greater than or equal to one-sixth of the winding diameter D of the first primary cover filament (1013a),
• wherein a dipole radiating antenna (10) is located in line with at least two first filaments of the carcass reinforcement (87),
• wherein the passive radiofrequency transponder (1, 1bis) is located axially on an outside of the inner end (841) of the bead (84) and radially between a radially outermost end (851) of the at least one spiral (85) and the axial end (861) of the crown reinforcement (86), and
• wherein a thickness of elastomer compound separating the outer cover filament (1013a, 1013b, 1024, 1025) of the passive radiofrequency transponder (1, 1bis), located radially outermost with respect to the first longitudinal axis (1030), and the reinforcing elements is greater than 0.5 millimeter.