An E-plane loaded sine waveguide for G-band traveling wave tube

Zheng Chang, Zhigang Lu, Peng Gao, Jingrui Duan, Xiaofan Gui, Zhenting Zheng, Zhanliang Wang, Shaomeng Wang and Yubin Gong

Journal of Electromagnetic Waves and Applications, 2024, vol. 38, issue 11, 1209-1219

Abstract: A new slow wave structure (SWS), named E-plane loaded sine waveguide (EPLSW) SWS is proposed for the development of G-band traveling wave tubes (TWTs). The structure, derived from the sine waveguide (SW) SWS, features staggered rectangular gratings on the two E-planes, intersecting with the sine-shaped gratings. The natural electron beam tunnel lies between these gratings. The EPLSW-SWS offers improved characteristics compared to the conventional SW-SWS. High-frequency simulation studies reveal that the passband of the EPLSW-SWS extends by more than 33 GHz over the SW-SWS under identical dispersion conditions. Additionally, the interaction impedance of EPLSW-SWS surpasses that of the SW-SWS in the frequency range of 195–255 GHz. Further analysis through particle-in-cell (PIC) results presents that when operating at 19.5 kV and 145 mA for the sheet beam current, it attains a maximum saturated power of 132.7W and a 3 dB bandwidth exceeding 50 GHz.

Date: 2024
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DOI: 10.1080/09205071.2024.2363402

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