Patent ID: 9203157
Filing Date: 2015-12-01
Classification: G06K,H01P,H01Q,H04B,Y10T

Abstract:
1. An antenna device comprising: a coil conductor having a loop shape or a spiral shape in which a winding center portion defines a coil opening; and a conductor layer that is closer to an antenna on a communication partner side than the coil conductor is relative to the antenna on the communication partner side; wherein the conductor layer includes a conductor opening and a slit, the slit connecting the conductor opening and an outer edge of the conductor layer; the conductor layer is larger than an area of a region in which the coil conductor is disposed; an inside diameter of the coil conductor is larger than a diameter of the conductor opening of the conductor layer; when the coil conductor is viewed in plan view, all portions of the coil conductor overlap the conductor layer and all portions of the conductor opening overlap the coil opening; when the coil conductor and the conductor layer are viewed in plan view, a distance from the outer edge of the conductor layer to an outer edge of the coil conductor is greater than a distance from a peripheral edge of the conductor opening to a peripheral edge of the coil opening around substantially entire peripheries of the coil conductor and the conductor layer; the conductor layer is arranged to function as a radiator to radiate a magnetic field; and the conductor layer is located on an inner surface or an outer surface of a casing of a mobile phone.