Patent ID: 7659863
Filing Date: 2010-02-09
Classification: H01Q

Abstract:
1. A tag antenna composed of a dipole antenna and a feeding part with an RFID chip mounted thereto and connected to the feeding part, comprising: the dipole part of an electrical length of about ⅙ to ⅜ of an antenna resonance wavelength; the feeding part provided in the center of said dipole part, wherein the dipole part comprises a first portion connected to the feeding part, second portions connected to and perpendicular to the first portion, and end parts connected to the second portions; an inductance part formed such as to surround said feeding part with said feeding part in the center and such that both ends are connected to said first portion of said dipole part, wherein the inductance part has a length shorter than a length of the first portion of the dipole part and so as to satisfy a resonance condition with a capacitance of the connected RFID chip, wherein the inductance part is arranged between the end parts and the dipole part; the end parts provided with an area larger than a line width of said dipole part, on both ends of the dipole antenna; and wherein the tag antenna uses a radio signal in an UHF band.