| 摘要 |
PROBLEM TO BE SOLVED: To enable efficient communication irrelevantly to installation conditions of a wireless ID tag such a position on an insulating plate, in air, on a metal surface, or in a hole bored in metal. SOLUTION: This device has its transmitting antenna 305 composed of 42 semicircular coils 301 and 302 and a switch 303 which controls the direction of the current of at least one coil is used to produce an intense magnetic field component which is perpendicular to the antenna coil of the wire less ID tag or parallel to the antenna coil of the wireless ID tag. |
