Patent ID: 8022888

Claim:
An antenna device, comprising: a substrate; a ground plane disposed on one surface of the substrate; a feed line disposed on the other surface of the substrate; a first radiator including: a first feed terminal connected to the feed line to receive a first feed signal; and a first ground terminal connected to the ground plane; a second radiator spaced apart from the first radiator at a predetermined distance and including: a second feed terminal; and a second ground terminal connected to the ground plane; and a phase shifter diverging from the feed line and connected to the second feed terminal for supplying a second feed signal to the second radiator, the second feed signal having a predetermined phase difference with the first feed signal, wherein a first current path is formed in at least one side of the ground plane by a current flowing through the first radiator, wherein a second current path is formed in the at least one side of the ground plane by a current flowing through the second radiator, and wherein the first and second radiators are arranged such that a loop antenna providing one current path is formed by capacitive coupling between the first radiator and the second radiator to cause the currents in the first current path and the second current path to cancel each other.