Patent ID: 8581114

Claim:
A package structure comprising: an insulating substrate having a ring-typed recess, an island portion and a surrounding portion defined by the ring-typed recess, wherein the ring-typed recess is laterally between the island portion and the surrounding portion; a ring-typed magnetic component placed in the ring-typed recess, wherein a gap is between an inner wall of the ring-typed recess and the ring-typed magnetic component, and the gap is full of air; an upper wiring layer above the insulating substrate and a lower wiring layer under the insulating substrate; a dielectric layer placed between the insulating substrate and the upper wiring layer or between the insulating substrate and the lower wiring layer; an inner cap layer and an outer cap layer respectively formed between the dielectric layer and the insulating substrate; an inner plated through hole vertically passing through the island portion to connect the inner cap layer and further passing through the dielectric layer to connect the upper wiring layer or the lower wiring layer; and an outer plated through hole vertically passing through the surrounding portion to connect the outer cap layer and further passing through the dielectric layer to connect the upper wiring layer or the lower wiring layer, wherein the inner cap layer and the outer cap layer respectively plug the inner plated through hole and the outer plated through hole; and wherein the inner plated through hole, the outer plated through hole, the upper wiring layer and the lower wiring layer forms a coil of wire surrounding the ring-typed magnetic component.