Composite sheet, method for manufacturing the same, and composite structure

A method for manufacturing a composite sheet, comprising:

• providing a film layer stack, wherein the film layer stack comprises a first resin layer, a metal layer and a second resin layer stacked in sequence, the metal layer is removably disposed on the first resin layer, and the second resin layer is removably disposed on the metal layer;
• performing a first hot-pressing step, wherein the film layer stack is heated and pressurized to fix the metal layer on the first resin layer and maintain the second resin layer to be removably disposed on the metal layer;
• removing the second resin layer and removably disposing a third resin layer on the metal layer to form another film layer stack;
• stacking a release member on the another film layer stack, wherein a surface of the release member is formed with a plurality of concave portions, and the surface of the release member faces the third resin layer;
• performing a second hot-pressing step, wherein the release member and the another film layer stack are heated and pressurized, so that the third resin layer is formed with a plurality of third resin protrusions corresponding to the plurality of concave portions, the metal layer is formed with a plurality of metal protrusions corresponding to the plurality of concave portions, and the first resin layer is formed with a plurality of first resin protrusions corresponding to the plurality of concave portions;
• and
• removing the release member.