Patent ID: 9515382
Filing Date: 2016-12-06
CPC Classification: H01Q

Claim Text:
1. An antenna device comprising: a feeding coil antenna; and a booster coil antenna electromagnetically coupled to the feeding coil antenna; wherein the feeding coil antenna includes a plurality of coil portions including at least one magnetic body and each including a coil conductor wound around the at least one magnetic body; the plurality of coil portions are connected to one another in an in-phase mode, and are arranged such that winding axes of the coil conductors are oriented approximately in a same direction and at least portions of respective openings of the coil conductors of at least two adjacent coil portions of the plurality of coil portions face one another with a gap therebetween; and the at least two adjacent coil portions are configured and arranged such that a first magnetic flux radiated from the feeding coil antenna defines a closed loop going around the coil conductors of the at least two adjacent coil portions so that the feeding coil antenna and the booster coil antenna are electromagnetically coupled to each other, and a second magnetic flux passing parallel to and on an inner side of the first magnetic flux penetrates into the gap between the at least two adjacent coil portions to define a closed loop.