| 摘要 |
A base mesa finger (an emitter ledge layer 15 , a base layer 16 , and a collector layer 17 ) is interposed between two collector fingers (collector electrodes 13 ), and on the base mesa finger, a base finger (a base electrode 12 ) and two emitter fingers (an emitter layer 14 and an emitter electrode 11 ) on both sides of the base finger, are formed. The two emitter fingers are formed symmetric with respect to the base finger as a reference.
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