Patent ID: 9627760
Date: 2017-04-18
CPC Classifications: H01Q

Claim:
1. An antenna device comprising: a main coil antenna; and a sub-coil antenna connected to the main coil antenna; wherein the main coil antenna has an outer size larger than an outer size of the sub-coil antenna; the main coil antenna and the sub-coil antenna are disposed so that a coil opening of the sub-coil antenna and a coil opening of the main coil antenna are arranged side by side in a plan view of the antenna device; the main coil antenna and the sub-coil antenna are disposed so that outer edges of the main coil antenna and the sub-coil antenna are spaced apart by a predetermined distance, are wound so as to generate magnetic fields having opposite phases, and are coupled to each other through the magnetic fields; a closed magnetic circuit is provided between the main coil antenna and the sub-coil antenna; directions of current loops of the main coil antenna and the sub-coil antenna are opposite to each other; a position of a hot spot of the antenna device is located outside of the main coil antenna when viewed along a winding axis of the main coil antenna; and a terminal electrode of the main coil antenna and a terminal electrode of the sub-coil antenna are electrically connected to each other and another terminal electrode of the main coil antenna and another terminal electrode of the sub-coil antenna are electrically connected to each other.