ANTENNA UNIT AND INFORMATION READER

摘要

PROBLEM TO BE SOLVED: To expand a radio communication area based upon an RW antenna without making the loop opening of the RW antenna too large and without making a structure and control associated with switching control over a plurality of RW antennas complicated.

SOLUTION: An antenna unit 3 connected by radio to an IC tag 4 out of which information can be read by radio is composed of an LC circuit, a plurality of the antenna units 3 are cascade-connected to constitute the RW antenna unit 2, and when the IC tag 4 is connected by radio, all the antenna units 3 are excited. Further, a reader writer device 1 performs congestion processing on the IC tag 4 as the object of information reading by the RW antenna unit 2 to correctly receive responses from respective IC tags 4.

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