| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna system which can prevent a receiving mistake even if a vehicle speed increases when detecting tire internal information such as tire internal pressure in a vehicle exterior. SOLUTION: Two antennas A, B are arranged so that centerlines of directivity a, b cross. Moreover, the centerline of directivity a of one antenna A is arranged to be an acute angle (α) to a travelling direction, the centerline b of the other antenna B is arranged to be an obtuse angle (β), and an angular difference (β-α) of the obtuse angle (β) and the acute angle (α) is made 60-120 degrees. COPYRIGHT: (C)2008,JPO&INPIT
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