Patent ID: 8637873

Claim:
A package comprising: a conductive base plate; a semiconductor device configured to be disposed on the conductive base plate; a metal wall configured to be disposed on the conductive base plate to house the semiconductor device; a through-hole configured to be disposed in input and output units of the metal wall; a lower layer feed through configured to be inserted into the through-hole and disposed on the conductive base plate; and an upper layer feed through configured to be disposed on the lower layer feed through, and adhered to a sidewall of the metal wall, wherein the lower layer feed through is surrounded by the metal wall, wherein a width of a part of the lower layer feed through is larger than that of the through-hole, the lower layer feed through is adhered to the sidewall of the metal wall, and a width of the upper layer feed through is larger than that of the through-hole, wherein the through-hole is airtight-sealed from an inside of the metal wall with the lower layer feed through and the upper layer feed through disposed on the lower layer feed through.