Patent ID: 7580000

Claim:
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 (W 1 +W 2 ) of a width (W 1 ) of the first dipole portion and a width (W 2 ) of the second dipole portion in the perpendicular direction to the longitudinal direction of the slot portion being about W 1 +W 2 =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.