VACUUM AMPLIFYING SHF UNIT WITH LONG-TERM FEEDBACK Russian patent published in 2009 - IPC H01J25/02 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electronic instruments, particularly, to vacuum amplifying SHF devices and may be used, for example, in traveling-wave tubes. SHF device with long-term feedback and operating frequency range from low F₁ to high F₂ is specific for the delay-line device structure being divided into, at least, one A-type section without gap in disperse characteristic within the operating frequency range F₁-F₂=ΔF, and, at least one B-type section having gap in disperse characteristic with reject band F₁'-F₂'=ΔF' within the operating frequency range ΔF and central reject frequency F_c'=(F₁'+F₂')/2, besides F₁'>F₁ and F₂'<F₂. The delay-line structure may be spiral with spring in B-type section being along the longitudinal axis of tube and represented as alternating sections of L₁ length with winding angle φ₁ and/or pace h₁ and length L₂ with winding angle φ₂ and/or pace h₂.

EFFECT: decreasing SHF device amplification factor frequency characteristic drop within operating frequencies, widening operating frequency bands and mitigating own noises from device.

8 cl, 5 dwg