| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress deterioration in reading accuracy of an RFID tag even if radiowave reflection from a floor surface or the like occurs regarding an antenna device and an RFID system using the same. <P>SOLUTION: An antenna device 7 is configured as follows. A first antenna element 8 is installed at an antenna installation part 16 of a body 14 so as to be close to targets. A second antenna element 9 is arranged at the rear of the first antenna element 8 so as to make the height of the second antenna element 9 higher than that of the first antenna element 8. By this arrangement, the first antenna element 8 and the second antenna element 9 are respectively arranged at positions different in a perspective direction and in a vertical direction. Consequently, the antenna device 7 suppresses deterioration in electric-field strength by switching between the first antenna element 8 and the second antenna element 9 even if a reflected wave of a radiowave from a floor surface and a direct wave of a radiowave interfere with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
