FIELD: electronics. SUBSTANCE: cathode for gyro- and relativistic SHF device has conical surface on which metal porous emitter is placed in annular groove. Emitter has profile of section in the form of trapezium. Bigger base L of trapezium is generating line of emitting surface. Angle α with this base lies within limits from 80 ≥α≥ 30 deg. Height of trapezium H amounts to 0.01 ≤H≤ 0.1 of value L. EFFECT: increased emission homogeneity of cathode with conical working surface. 1 dwg , 1 tbl
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