Stacked Coil for Wireless Charging Structure on InFO Package

A structure comprising:

• a plurality of molding compound layers;
• a plurality of polymer layers, wherein the plurality of molding compound layers and the plurality of polymer layers form a stack, and the plurality of molding compound layers and the plurality of polymer layers are arranged alternatingly in the stack;
• a plurality of coils in the plurality of molding compound layers, wherein each of the plurality of coils has a first top surface coplanar with a second top surface of one of the plurality of molding compound layers, and a first bottom surface coplanar with a second bottom surface of the one of the plurality of molding compound layers;
• and
• a plurality of vias in the plurality of molding compound layers and the plurality of polymer layers, wherein the plurality of vias are electrically connected to the plurality of coils.

A structure comprising:

• a power receiving circuit comprising:
• a circuit selected from the group consisting of a matching circuit, a charging circuit, a power management circuit, a battery, and combinations thereof;
• and
• a coil module comprising:
• a plurality of molding compound layers, wherein each of the plurality of molding compound layers comprises a base material, and filler particles in the base material;
• and
• a plurality of coils, wherein each of the plurality of coils is in one of the plurality of molding compound layers, and wherein the plurality of coils are electrically connected to the power receiving circuit.