Semiconductor device for ultrahigh frequency band and semiconductor apparatus including the semiconductor device

A semiconductor apparatus comprising:

• a semiconductor device including a semiconductor chip,
• a sheet-like metal member electrically connected to the semiconductor chip and serving as a ground electrode for the chip,
• input/output electrodes electrically connected to the semiconductor chip and situated in the same plane as that of the sheet-like metal member, and
• a circuit board having a face for mounting the semiconductor device thereon;
• said chip, said sheet-like metal member, and said input/output electrodes being encapsulated with an electrically insulating member having a bottom surface, and
• wherein the sheet-like metal member in the semiconductor device is brought out from inside the electrically insulating member without being bent and has first and second end faces, said first end face situated in substantially the same plane as the bottom surface of the electrically insulating member and that surface of the electrically insulating member including the first end face of the metal member is so mounted as to face to the surface of the circuit board, and
• wherein the second end face of the sheet-like metal member is brought out from the electrically insulating member of rectangular parallelepiped.