Patent ID: 7671807

Claim:
A high-directional wide-bandwidth antenna for using in a RFID tag, comprising: a first element comprising a conductor and having one end serving as a first feeding point, wherein an electricity of the first feeding point is equivalent to an inductive reactance; a first radiating body having one end connected to the first element and the other end being a coupling surface; a second radiating body having one end serving as a second feeding point, wherein the second radiating body extends to the coupling surface of the first radiating body through the second feeding point, such that energy is transferred between the first radiating body and the second radiating body through the coupling surface; a third radiating body having one end connected to the first radiating body and the first element, and the other end extending outwardly; and a fourth radiating body having one end connected to the first radiating body, the third radiating body and the first element, and the other end extending outwardly; wherein the first radiating body and the second radiating body attain a first resonant frequency, and the third radiating body and the fourth radiating body attain a second resonant frequency.