WIRELESS COMMUNICATION DEVICE, RF TAG READER WRITER, AND PRINTER

摘要

PROBLEM TO BE SOLVED: To surely communicate with only a desired RF tag when communicating with RF tags incorporated in labels successively stuck on a mounting.

SOLUTION: When an antenna 7a is arranged at a distance of an integral multiple of a half of the wavelength of a radio wave reflected by a radiation element 21 of the antenna 7a from a reflecting surface of a reflecting means 9, the radio wave reflected by the antenna 7a is inverted in polarity and reflected by the reflecting means 9 and the radio wave whose polarity is inverted is received again by the antenna 7a. Consequently, the electric field intensity at a position which is at a distance of an odd multiple of a quarter of the wavelength of the radio wave reflected by the radiation element 21 of the antenna 7a from the reflecting means 9 can be increased. An area that an RF tag T passes through is set at the position which is at a distance of an odd multiple of a quarter of the wavelength of the radio wave reflected by the radiation element 21 of the antenna 7a from the reflecting means 9 to expose the passing RF tag T to a radio wave having high electric field intensity.

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