Patent ID: 7436372
Filing Date: 2008-10-14
Classification: G04R,H01Q

Abstract:
1. An antenna device adapted to be installed in a case of an electronic equipment, the case including a housing space for housing the antenna device and a surface in which an aperture is formed, and the aperture allowing access from an external space to the housing space, the antenna device comprising: a magnetic substance; and a coil wound around the magnetic substance; wherein the magnetic substance includes a coil winding portion, around which the coil is wound, and a pair of coil non-winding portions, which protrude from both ends of the coil winding portion, around each of which the coil is not wound, and which are magnetically coupled with the coil winding portion; wherein at least one of the coil non-winding portions is curved in an arc shape toward a distal end thereof from a base thereof so as to extend along an inner peripheral surface of the housing space when the antenna device is housed in the housing space and is viewed from the surface of the case; wherein the magnetic substance comprises a core member that includes the coil winding portion and the pair of coil non-winding portions; wherein the core member comprises a laminated core member that includes a plurality of sheet plates, each of which is formed of a magnetic material and is mutually laminated; wherein the plurality of sheet plates of the laminated core member are classified into a plurality of groups, each of which has a length different from another length in a longitudinal direction thereof; and wherein the plurality of groups of the plurality of sheet plates of the laminated core member are combined so that the lengths decrease step by step from a group that is closest to the surface of the case along a depth direction of the housing space to a group that is most distant from the surface of the case when the antenna device is housed in the housing space of the case of the electronic eguipment.