| 摘要 |
PURPOSE:To raise the withstand voltage between a gate and a drain by means of forming electrode into the shape of arcs. CONSTITUTION:A drain electrode 2 is formed opposing to a gate electrode 1 taking the shape of an arc at a distance of L. The shape of side 2A of the drain electrode 2 is taken to be formed into the concentric circle of an arc 1A formed by the side of gate electrode 1 making its radius rd smaller than the radius rj of arc 1A. In such a constitution, the withstand voltage between the gate and the drain when the radius rj is limited can be raised compared with the case when the radius rj is unlimited.
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