Patent ID: 8026595

Claim:
A semiconductor device comprising: a substrate; a gate electrode, a source electrode, and a drain electrode which are placed on a first surface of the substrate and have at least one or more fingers, respectively; a gate terminal electrode, a source terminal electrode, and a drain terminal electrode which are placed on the first surface of the substrate, governs or joined with a plurality of respective electrode fingers; an active area placed on an underneath part of the gate electrode, the source electrode, and the drain electrode, on the substrate between the gate electrode and the source electrodes, and on the substrate between the gate electrode and the drain electrode; a via hole connected to the source terminal electrode, respectively; a sealing layer which is placed above and separated vertically from any one of the active area, the gate electrode, the source electrode, and the drain electrode through a cavity part, and performs a hermetic seal of the active area, the gate electrode, the source electrode, and the drain electrode; and a first insulating film placed on the source electrode and the drain electrode, on the substrate between the gate electrode and the drain electrode, and on the substrate between the gate electrode and the source electrode.