| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve useful and efficient communication even when distribution in a polarization plane direction of a tag antenna is biased in a plurality of radio tag circuit elements. <P>SOLUTION: A reader 1 is provided with a tag antenna 151 for transmitting/receiving information with an IC circuit part 150 which stores information, and configured to read information for a plurality of radio tag circuit elements To having different polarization plane directions of the tag antenna 151. A Q value corresponding to the distribution state of the plurality of radio tag circuit elements To in a service area 20 of the reader 1 is acquired, and a switching time interval for switching the polarization plane direction of the reader antenna 3 during radio communication to a plurality of directions is set based on the acquired Q value. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
