Patent ID: 7091534

Claim:
A semiconductor device comprising: (a) a base having a first surface and a second surface located on an opposite side to the first surface; the base including a low dielectric constant material film whose relative dielectric constant is lower than silicon; (b) a first semiconductor element layer including a semiconductor element and an insulator film burying the semiconductor element; the first semiconductor element layer being formed on or over the first surface of the base directly or by way of another layer; (c) a first wiring layer formed on or over the first semiconductor element layer directly or by way of another layer; and (d) an electrode formed on the second surface of the base; the electrode forming a return path for a signal transmitted through the first wiring layer; wherein the base, the first semiconductor element layer, and the first wiring layer constitute a three-dimensional stacked structure; and the semiconductor element of the first semiconductor element layer is formed by using an island-shaped semiconductor film, where the semiconductor film has a limited dimension that realizes a necessary characteristic of the semiconductor element.