Patent ID: 7259644

Claim:
A substrate having a microstrip line structure, comprising: a plurality of longitudinally-extending trenches formed into at least one main surface of a base body constituting said substrate and disposed in a juxtaposed manner relative to each other as viewed in cross-section, each one of the plurality of trenches having an arcuate inner surface geometry as viewed in cross-section; a laminate film having a ground conductive layer and an insulating layer formed along and entirely covering the inner surface geometry of each one of said plurality of trenches; and a plurality of rectilinearly-extending signal line layers, each one of the plurality of signal line layers constituting said microstrip line formed into a respective one of said laminate films; wherein respective ones of said signal line layers are separated from one another by adjacent, contiguous ones of the laminate films, wherein said base body is an insulator, and wherein said base body is formed integrally with a semiconductor.