Metal pattern on electromagnetic absorber structure
A metal pattern formed in the electromagnetic absorber structure is provided. By performing the laser treatment to form the active layer thereon, the metal pattern can be regionally formed on the electromagnetic absorber structure in the following electroless plating processes.
1. An electromagnetic absorber structure having a metal pattern, the electromagnetic absorber structure comprising:
an electromagnetic absorber layer disposed in the electromagnetic absorber structure;
at least an insulative layer covering the surface of the electromagnetic absorber layer, wherein the electromagnetic absorber structure has at least a predetermined region, and the surface of the electromagnetic absorber layer overlapping with the predetermined region is not covered by the insulative layer; and
the metal pattern located within the predetermined region and on the surface of the electromagnetic absorber layer of the electromagnetic absorber structure.
2. The electromagnetic absorber structure according to claim 1 , wherein the insulative layer is a stack of a polyethylene terephthalate layer and an adhesive layer.
3. The electromagnetic absorber structure according to claim 1 , wherein the material of the electromagnetic absorber layer is manganese-zinc ferrite or nickel-zinc ferrite.
4. The electromagnetic absorber structure according to claim 3 , wherein the metal pattern further comprises an antenna structure.
5. The electromagnetic absorber structure according to claim 4 , wherein the material of the antenna structure comprises copper, nickel, gold, silver or a combination thereof.
6. The electromagnetic absorber structure according to claim 4 , wherein the metal pattern comprises at least a contact pad or a metal thorough hole.
7. The electromagnetic absorber structure according to claim 6 , wherein the contact pad is a copper pad covered by a nickel layer and a gold layer.
8. An electromagnetic absorber structure having a metal pattern, the electromagnetic absorber structure comprising:
an electromagnetic absorber layer disposed in the electromagnetic absorber structure;
at least an insulative layer covering the surface of the electromagnetic absorber layer, wherein the electromagnetic absorber structure has at least a predetermined region, and the surface of the electromagnetic absorber layer overlapping with the predetermined region has an active layer; and
the metal pattern directly disposed on the active layer of the surface of the electromagnetic absorber layer in the predetermined region.
9. The electromagnetic absorber structure according to claim 8 , wherein the material of the electromagnetic absorber layer is manganese-zinc ferrite or nickel-zinc ferrite.
10. The electromagnetic absorber structure according to claim 9 , wherein the surface of the electromagnetic absorber layer overlapping with the predetermined region is treated by laser, thereby activating the surface of the electromagnetic absorber layer to form the active layer.
11. The electromagnetic absorber structure according to claim 10 , wherein the metal pattern is formed by using the active layer as a seed layer via an electroless plating process.
12. The electromagnetic absorber structure according to claim 11 , wherein the metal pattern further comprises an antenna structure, and the material of the antenna structure comprises copper, nickel, gold, silver or a combination thereof.
13. The electromagnetic absorber structure according to claim 11 , wherein the metal pattern comprises at least a contact pad or a metal thorough hole.
14. The electromagnetic absorber structure according to claim 13 , wherein the contact pad is a copper pad covered by a nickel layer and a gold layer.