A process for absorbing ethylene comprising preparing a support material impregnated with an aqueous sodium permanganate solution, wherein the ethylene absorption agent is prepared by a process of selecting a support material, preparing a sodium permanganate solution, and impregnating the carrier material with the sodium permanganate solution. The conductor of the core layer includes plating filling the hole of the core layer. A power bar extends in an area between the signal lead embedded portions and the die and has a first side opposing the signal leads and a second side opposing the die.