20080246140 10-09-2008 [Description] 
SEMICONDUCTOR DEVICE - A frame-shaped sidewall is provided on a metallic base plate surrounding a semiconductor element arranged on the metallic base plate, a first dielectric plate is arranged on one side of the semiconductor element and a first circuit pattern is formed on its surface, a second dielectric plate is arranged on another side of the semiconductor element and a second circuit pattern is formed and the first and the second dielectric plate. Power supply portions are provided on a part of the sidewall, through which a first or a second band-shaped conductors is penetrating. A relay post is provided on the dielectric plate. The first band-shaped conductor is connected to the circuit pattern by an interconnection via the relay post.