Patent ID: 7324058
Filing Date: 2008-01-29
Classification: H01Q

Abstract:
1. A tag antenna for transmitting/receiving a radio signal to/from an RFID reader/writer in an RFID system, comprising a pair of antenna elements centered on a feeding point, wherein when a carrier wavelength of the radio signal is λ, each of the pair of the antenna elements comprises: a dipole portion which has a length from the feeding point of approximately λ/4 and a plurality of bending portions; and a circular polarized wave generation portion linked to an end of the dipole portion and, each dipole portion of the pair of the antenna elements includes two (2) parallel linear portions and a third linear potion linking the two (2) linear portions, wherein an end of one linear portion of the two (2) parallel linear portions is connected to a feeding point, wherein the circular polarized wave generation portion is connected to an end of the other linear portion of the two (2) parallel linear portions, and wherein the circular polarized wave generation portion has a triangular shape having a first side conforming with an extending direction of the other linear portion of the two (2) parallel linear portions and a second side perpendicular to the first side.