Patent ID: 7928921
Filing Date: 2011-04-19
Classification: G06K,H01Q

Abstract:
1. A tag-use antenna comprising a dipole antenna, a feed part and an inductance part formed by a conductor in the same flat plane, wherein the feed part is formed at the center of the dipole antenna and is able to mount a chip, the inductance part is connected to the feed part in parallel with a dipole of the dipole antenna, and the dipole antenna is formed in a rectangular spiral by being bent inward from both ends at bending parts which bend the dipole at least in four places respectively, with the entire length of each of the bending parts of the four places being shorter than one half of a resonance wavelength of the antenna when the bending parts are extended to a straight line, wherein the four bending parts are formed on either of both dipole parts for a size of 53 mm horizontal by 7 mm vertical, a number of bending parts is increased to more than four to make the dipole smaller, wherein the inductance part is formed in the neighborhood of the center of the dipole antenna, and placed in the middle of the dipole antenna, which is formed in said rectangular spiral, of the dipole antenna.