| 摘要 |
PROBLEM TO BE SOLVED: To accurately manage a tire by attaching a shielding plate composed of a conductive material for limiting a reading range to a reading antenna for a transponder. SOLUTION: A reading antenna 3 is provided with a shielding plate 7 for limiting the reading range. The shielding plate 7 larger than an antenna pattern 3a is attached to one side of the reading antenna 3 via a spacer. The shielding plate 7 is composed of a conductive material having a shielding effect of an electric wave. The conductive material is not specified, however, metal such as iron and lead, carbon, etc., can be used for it. The shielding material may be constituted of only the conductive material, a material formed by mixing particulate of the conductive material with matrix such as resin, or a material formed by molding the conductive material into mesh. |
