发明名称 |
Tag antenna, tag and RFID system using the same |
摘要 |
A communication distance difference due to an attached object can be canceled, and an RFID system can be provided which has approximately the same communication distance regardless of an attached position (surface) of a tag. A tag antenna used for such the RFID system is for transmitting/receiving a radio signal to/from an RFID reader/writer in an RFID system has a pair of antenna elements centered on a feeding point and when a carrier wavelength of the radio signal is », each of the pair of the antenna elements includes a dipole portion which has a length from the feeding point of approximate » /4 and a plurality of bending portions as well as a circular polarized wave generation portion linked to an end of the dipole portion.
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申请公布号 |
EP1780829(A1) |
申请公布日期 |
2007.05.02 |
申请号 |
EP20060001963 |
申请日期 |
2006.01.31 |
申请人 |
FUJITSU LTD. |
发明人 |
KAI, MANABU;MANIWA, TORU;YAMAGAJO, TAKASHI |
分类号 |
H01Q9/16;H01Q1/22 |
主分类号 |
H01Q9/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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