Abstract
A W-band sheet electron beam (SEB) traveling-wave tube (TWT) based on flat-roofed sine waveguide slow-wave structure (FRSWG-SWS) is proposed. The sine wave of the metal grating is replaced by a flat-roofed sine wave around the electron beam tunnel. The slow-wave characteristics including the dispersion properties and interaction impedance have been investigated by using the eigenmode solver in the 3-D electromagnetic simulation software Ansoft HFSS. Through calculations, the FRSWG SWS possesses the larger average interaction impedance than the conventional sine waveguide (SWG) SWS in the frequency range of 86-110 GHz. The beam-wave interaction was studied and particle-in-cell simulation results show that the SEB TWT can produce output power over 120 W within the bandwidth ranging from 90 to 100 GHz, and the maximum output power is 226 W at typical frequency 94 GHz, corresponding electron efficiency of 5.89%.
Highlights
The W-band electromagnetic wave spectrum is extensively used in many scientific and technological fields, such as spectroscopy, diagnostics systems, high resolution imaging, and space applications.[1,2,3,4] The traveling-wave tube (TWT) is a typical vacuum device invented for amplification of radio frequency power
We investigated a ridge-loaded sine waveguide TWT at the G band with cylindrical electron beam and its current density is pretty large.[11]
As a novel type of SWS, the FRSWG SWS can be suggested as a promising beam-wave interaction circuit in the millimeter wave and terahertz band because of its excellent transmission properties and large average interaction impedance
Summary
1. 3-D model and dimensional parameters of FRSWG SWS: (a) perspective view, (b) single slow wave structure. The FRSWG is easy to fabricate by Nano CNC Milling Technology and can be made at a time.[15]
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