Study of the waveguide elements for mm-wave traveling wave tube

25th International Conference on Vacuum Technique and Technology

Ivanov, A.S.^1 ; Mikhailova, O.N.^1 ; Titov, V.N.^1 ; Tupitsyn, A.D.^1

School of Electronics, Saint Petersburg Electrotechnical University LETI, Saint Petersburg

197376, Russia^1

关键词: Electrical discharge machining;    Folded waveguides;    Interaction systems;    Interactive system;    Low surface roughness;    Millimeter band;    Short wavelengths;    Vacuum electron devices;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/387/1/012028/pdf
DOI  :  10.1088/1757-899X/387/1/012028

来源: IOP

【 摘 要 】

The use of a millimeter waves for future mobile networks demands a creation of broadband transceivers with output power more than 10 W. Only vacuum electron devices, in particularly, traveling wave tubes can provide those parameters. Because of the short wavelength, the reference dimension of the interaction system becomes close to 100 microns and skin layer depth reaches 0,4 micron. Its fabrication comes across with low surface roughness challenge. In this paper, we evaluate interaction system elements fabricated by electrical discharge machining. The surface roughness of the microdimensional slot in a brass plate is determined experimentally. Based on the experimental roughness value, a computer simulation of a folded waveguide, a perspective type of an interactive system for a millimeter band traveling wave tube has been carried out. It is found that the loss value on the 40-period waveguide due to the roughness increases by 80 % in comparison with the ideal surface of the waveguide walls.