| US 7,516,901 B2 | ||
| RFID tag | ||
| Takashi Yamagajo, Yokosuka (Japan); Toru Maniwa, Setagaya (Japan); Manabu Kai, Yokosuka (Japan); Shunji Baba, Kawasaki (Japan); and Yuichi Nakanishi, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Oct. 24, 2005, as Appl. No. 11/256,056. | ||
| Claims priority of application No. 2005-075379 (JP), filed on Mar. 16, 2005. | ||
| Prior Publication US 2006/0208095 A1, Sep. 21, 2006 | ||
| Int. Cl. G06K 19/06 (2006.01) | ||
| U.S. Cl. 235—492 [235/451; 340/572.7] | 12 Claims |
| 1. An RFID tag comprising:
a transmitting and receiving antenna formed on a substrate;
a detecting block having a pattern formed on the substrate in a circumference of the antenna and operable to detect breakdown
of the pattern of the detecting block on the substrate; and
an electronic component connected to the antenna and the detecting block;
wherein the detecting block is formed of a conductive material and loops of two lines, and has a length of a non-integer multiple
of a half-wavelength of an operating frequency of the RFID tag, in order to not change a transmitting distance regardless
of discommunication of the loops.
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