Patent ID: 8745855
Filing Date: 2014-06-10
Classification: G06K,H01Q,Y10T

Abstract:
1. A method for manufacturing an antenna device that is inductively coupled to a transmitter on receipt of a magnetic field transmitted at preset an oscillation frequency from the transmitter to provide for a communication enabled state, the method comprising: forming a resonance circuit including an antenna coil that receives the magnetic field transmitted from the transmitter and a variable capacitor electrically connected to the antenna coil so that a resonance frequency of the resonance circuit will be lower than the preset oscillation frequency; and affixing a magnetic sheet to the antenna coil via an insulation material, wherein the magnetic sheet is formed at a face-to-face position with respect to the antenna coil and configured to change an inductance of the antenna coil, and a thickness of the insulation material allows the inductance to change so that the resonance frequency of the resonance circuit is coincident with the oscillation frequency depending on a spacing between the antenna coil and the magnetic sheet, and wherein the affixing of the magnetic sheet comprises: