Patent ID: 8400248

Claim:
A wireless power transfer device comprising: a base substrate including a base coil; transmission substrates spaced from the base substrate and including transmission coils; and a contact plug penetrating the base substrate and the transmission substrates to connect one ends of the transmission coils, wherein: the transmission coils have the greater turn number than the base coil and transmitting/receiving a power signal through a magnetic resonance method; the contact plug comprises first and second contact plugs; the transmission substrates comprise first to third transmission substrates including first to third transmission coils, respectively, the second transmission substrate being disposed between the first and third transmission substrates; the first contact plug connects one ends of the respectively adjacent first and second transmission coils and the second contact plug connects the other ends of the respectively adjacent second and third transmission coils; and the first contact plug is insulated from the third transmission coil and the second contact plug is insulated from the first transmission coil.