Patent ID: 6509641
Filing Date: 2003-01-21
Classification: H01L

Abstract:
A high-frequency signal amplification device, comprising:a dielectric multilayer substrate comprising a plurality of dielectric layers; a semiconductor element with high-frequency signal amplification function mounted on the dielectric multilayer substrate; a plurality of metal conductors, each conductor being arranged between the plurality of dielectric layers or at a surface of the dielectric multilayer substrate; and a metal surface that is arranged at a position lower than the plurality of metal conductors; wherein a surface of the dielectric multilayer substrate defines a cavity where a portion of the dielectric layers is removed; wherein in the cavity, all surfaces of the dielectric layers that face outward from the cavity are all completely covered with the metal conductors or the metal surface; wherein the semiconductor element is mounted at the cavity; and wherein a high-frequency signal is input into the semiconductor element via at least one of the plurality of metal conductors, and an amplified high-frequency signal is output from the semiconductor element via at least another one of the plurality of metal conductors.