Patent ID: 8338866

Claim:
A microwave semiconductor device comprising: a buffer layer composed of GaN series material formed on a semiconductor substrate; an active layer composed of GaN series material formed on the buffer layer; a plurality of drain electrodes and a plurality of source electrodes alternately arrayed on the active layer to make an ohmic junction with the active layer; a plurality of gate electrodes, each of which is formed between each one of the drain electrodes and each one of the source electrodes to make Schottky junction with the active layer; a plurality of source electrode pads formed on the buffer layer and connected with one ends of the plurality of source electrodes; a drain electrode pad formed on the buffer layer facing the plurality of source electrode pads; an underlying metal formed on the buffer layer between the plurality of source electrode pads and the active layer with the same material as the drain electrodes and the source electrodes; a gate electrode connecting line formed on the underlying metal to which each one end of the plurality of gate electrodes is connected; and a plurality of gate electrode pads formed on the buffer layer between each of the source electrode pads each one end of which is connected with the gate electrode connecting line.