| US 7,535,365 B2 | ||
| Radio frequency IC tag and method for manufacturing same | ||
| Isao Sakama, Hiratsuka (Japan); and Minoru Ashizawa, Tokyo (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
| Filed on Dec. 16, 2005, as Appl. No. 11/304,776. | ||
| Claims priority of application No. 2005-132771 (JP), filed on Apr. 28, 2005. | ||
| Prior Publication US 2006/0244604 A1, Nov. 02, 2006 | ||
| Int. Cl. G08B 13/14 (2006.01) | ||
| U.S. Cl. 340—572.7 [340/572.1] | 19 Claims |
| 1. A radio frequency IC tag which transmits information recorded on an IC chip by radio, comprising:
a first antenna which is equipped with the IC chip and transmits the information recorded on the IC chip by radio waves;
a second antenna to amplify a radio wave radiated from the first antenna to produce an amplified radio wave and to radiate
the amplified radio wave to transmit the information recorded on the IC chip by radio; and
a hollow case,
wherein the first antenna and the second antenna are respectively placed to face one another in opposing positions with a
predetermined distance therebetween inside the hollow case.
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