METHOD FOR GENERATING ELECTROMAGNETIC WAVES IN DOUBLE-BEAM MICROWAVE VACUUM TUBE Russian patent published in 2002 - IPC

FIELD: microwave electronics. SUBSTANCE: method involves simultaneous generation of two electron beams so that electron velocity in one of them is other than that in other beam; both beams are modulated and then passed unidirectionally through one channel. In modulating beam density single-velocity beams are maintained in order to ensure that modulation frequencies of first and second beams ω₁ and ω₂, respectively, meet condition , where v₁ and v₂ are electron velocities in first and second beams, respectively; v_ph is phase velocity of microwave generated in channel at frequency . This condition being satisfied, phase velocity of spatial-charge beat wave will exceed v_ph,; two modes of travelling-wave and backward-wave tubes are possible under these conditions. EFFECT: enhanced efficiency of microwave tube. 6 dwg