| US 7,580,000 B2 | ||
| Folding dipole antenna and tag using the same | ||
| Manabu Kai, Kawasaki (Japan); Toru Maniwa, Kawasaki (Japan); and Takashi Yamagajo, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Apr. 26, 2006, as Appl. No. 11/411,498. | ||
| Claims priority of application No. 2006-023646 (JP), filed on Jan. 31, 2006. | ||
| Prior Publication US 2007/0176839 A1, Aug. 02, 2007 | ||
| Int. Cl. H01Q 9/26 (2006.01) | ||
| U.S. Cl. 343—803 [343/730; 343/795; 340/572.7] | 7 Claims |
| 1. A folded dipole antenna comprising:
a first dipole portion having a feeding portion; and
a second dipole portion having ends connected to ends of the first dipole portion to form a slot portion; wherein
a length, in a longitudinal direction of the slot portion, of the first and the second dipole portions being λ/2 in an RFID
frequency bandwidth, and a total sum (W1+W2) of a width (W1) of the first dipole portion and a width (W2) of the second dipole portion in the perpendicular direction to the longitudinal direction of the slot portion being about
W1+W2=λ/20 for generating a linearly-polarized wave in the perpendicular direction to the slot portion, when a RFID chip is mounted
on the feeding portion.
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