| 发明名称 |
ANTENNA DEVICE, RADIO TAG READER, AND ARTICLE MANAGEMENT SYSTEM |
| 摘要 |
<P>PROBLEM TO BE SOLVED: To read information only from a desired radio tag by suppressing unwanted radiation from an antenna element. <P>SOLUTION: An antenna device includes an antenna element which is wound in a spiral loop-like shape with one end as a base; and a feed point provided at another end of the antenna element, wherein a length from the one end of the antenna element to the other end thereof is about one half wavelength of operating frequency. <P>COPYRIGHT: (C)2009,JPO&INPIT |
| 申请公布号 |
JP2009118406(A) |
申请公布日期 |
2009.05.28 |
| 申请号 |
JP20070292121 |
申请日期 |
2007.11.09 |
| 申请人 |
TOSHIBA CORP |
发明人 |
YAMADA AKIKO;SEKINE SHUICHI |
| 分类号 |
H01Q9/27;G06K17/00;H01Q7/00;H04B5/02 |
主分类号 |
H01Q9/27 |
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