Patent ID: 6933450

Claim:
A high-frequency signal transmitting device, comprising: a layered substrate including an uppermost dielectric layer, a bottommost dielectric layer, and a plurality of intermediate dielectric layers located between the uppermost and bottommost dielectric layers; signal wiring conductors provided between one end and an inner side on the upper surface of the uppermost dielectric layer and between the other end opposite from the one end and the inner side on the lower surface of the bottommost dielectric layer; grounding conductors provided on the upper surfaces of the respective intermediate dielectric layers and the bottommost dielectric layer and surrounding grounding-conductor non-forming areas of a specified shape provided on the respective dielectric layers; a signal via conductor vertically penetrating the uppermost dielectric layer and provided within an area facing the grounding-conductor non-forming area on the upper surface of the uppermost intermediate dielectric layer; a signal via conductor vertically penetrating the bottommost dielectric layer and provided within an area facing the grounding-conductor non-forming area on the upper surface of the bottommost dielectric layer; signal via conductors vertically penetrating the respective intermediate dielectric layers and provided within the grounding-conductor non-forming areas of the respective dielectric layers; signal-wiring connecting conductors provided on the upper surface of the uppermost dielectric layer and on the lower surface of the bottommost dielectric layer and connecting the signal wiring conductors of the uppermost and bottommost dielectric layers with the signal via conductors; via conductor connecting conductors provided on the upper surfaces of the respective intermediate dielectric layers and the bottommost dielectric layer and connecting the signal via conductors of the respective dielectric layers with those of the dielectric layers right thereabove; and grounding-conductor via conductors vertically penetrating the respective intermediate dielectric layers and connecting the respective grounding conductors at a plurality of positions around the grounding-conductor non-forming areas of the respective dielectric layers.