To provide a tire state measuring RFID system capable of surely measuring a tire state of a tire such as a pressure, an antenna of a tag and a wheel equipped with the antenna.
A flexible magnetic material 10 in a shape of a plate is wound around an outer periphery of the wheel 6b for holding a tire 6a of a vehicle, a conductor is wound around thereof so as to form an antenna coil 3a of the tag 3, and a part such as an electric circuit of the tag 3 or a pressure detector is installed on the wheel 6b. Thereby, the antenna coil 3a is prevented from being damaged even when the tire 6a is expanded or contracted at traveling of the vehicle, and the electric circuit of the tag 3 is prevented from being broken by the frictional heat between the tire 6a and a road. The antenna coil 3a and the electric circuit are installed on a part near a rotational shaft of the wheel 6, and thereby influence by the centrifugal force can be also eased. Further, the tag 3 can be used again even when the tire 6a is damaged.
UBUKATA YASUHIRO
HACHIMAN SEIRO
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