| 摘要 |
The arrangement of a magnetic coupling coil ( 2 ) and a transponder circuit ( 1 ) on a vehicle wheel ( 5 ) allows wireless data communication with an interrogation circuit ( 3 ) arranged on a fixed structure of the vehicle on which the wheel is mounted so as to be able to rotate about at least one rotational axis ( 9 ). The magnetic coupling coil is mounted coaxially to the rotational axis of the wheel and defines a closed loop. This coupling coil acts as an inductive coupling interface between an antenna coil ( 10 ) of the transponder and an excitation coil ( 4 ) of the interrogation circuit. This magnetic coupling coil comprises a loop portion ( 2'' ) oriented such that the magnetic field ( 11' ) in the magnetic coupling coil, which is induced by a primary magnetic field ( 8 ) generated by the interrogation circuit excitation coil, is directed in this loop portion in a substantially perpendicular direction to the primary magnetic field. The antenna coil ( 10 ) of the transponder circuit, which is arranged in a winding ( 2'' ) of the coupling coil loop portion, is oriented so that only the magnetic field induced in the coupling coil loop portion passes therethrough without being influenced by the primary magnetic field.
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