Patent ID: 7994637

Claim:
A high-frequency semiconductor device, comprising: two unit semiconductor devices, each of which includes a ground substrate having a heat-radiating property, only one side of the ground substrate having a high-frequency semiconductor element; the high-frequency semiconductor element on the ground substrate; an input-side matching circuit connected to the high-frequency semiconductor element; an output-side matching circuit connected to the high-frequency semiconductor element; a side wall member surrounding at least the high-frequency semiconductor element; an input terminal connected to the input-side matching circuit; and an output terminal connected to the output-side matching circuit, wherein one of the two unit semiconductor devices is identical to an other of the two unit semiconductor devices, the two unit semiconductor devices are coupled to each other through a conductive plate extending from portions of the side wall members to opposing portions of the side wall members across the high-frequency semiconductor elements, and the one of the two unit semiconductor devices is positioned upside down relative to the other of the two unit semiconductor devices.