Patent ID: 8847844

Claim:
An antenna comprising: a first coil electrode having a planar coil shape and including a first end portion and a second end portion; a second coil electrode that is spaced apart from the first coil electrode by a predetermined distance, has a planar coil shape and includes a third end portion and a fourth end portion; a first connection electrode and a second connection electrode arranged to allow the second end portion of the first coil electrode and the fourth end portion of the second coil electrode to be connected to an external device; and a central electrode that is arranged between the fourth end portion and the second connection electrode; wherein the first coil electrode, the second coil electrode, the first connection electrode, the second connection electrode and the central electrode are arranged such that the first end portion and the third end portion are capacitively coupled, the second end portion and the first connection electrode are capacitively coupled, the fourth end portion and the central electrode are capacitively coupled, and the central electrode and the second connection electrode are capacitively coupled; and a coupling capacitance between the first end portion and the third end portion is larger than a coupling capacitance between the second end portion and the first connection electrode and a coupling capacitance between the fourth end portion and the central electrode is larger than a coupling capacitance between the central electrode and the second connection electrode.