Antenna for radio transponder

摘要

An annular apparatus (26) embedded in a substantially nonconductive elastomeric material (22) located within the toroidal region of a pneumatic tire (10) or on the radially outer side of the wheel rim on which a pneumatic tire is mounted. The apparatus may be incorporated in a ring of elastomeric material attached to the rim. The apparatus is coaxially positioned with respect to the tire or wheel and preferably is embedded in the tire at its equatorial plane (EP), and includes a radio-frequency transponder (28) including an integrated circuit chip; and optional sensors in the chip or associated with the chip; the integrated circuit chip of the transponder has at least the capacity to transmit data relating to tire or wheel identification. The antenna comprises a composite of an electrical conductor and a rubber matrix wherein the composite is capable of substantial elongation.