An elliptical beam-tunnel sine waveguide slow wave structure for G-band elliptical beam traveling wave tube

Junwan Zhu, Jingrui Duan, Zhigang Lu, Zhanliang Wang, Huarong Gong and Yubin Gong

Journal of Electromagnetic Waves and Applications, 2023, vol. 37, issue 6, 794-802

Abstract: In order to improve the performance of sine waveguide (SW) traveling wave tube (TWT), an elliptical beam-tunnel sine waveguide (EBTSW) slow wave structure (SWS) is proposed. EBTSW-SWS not only has high interaction impedance in a relatively wide frequency band but also has an elliptical beam-tunnel. The simulation results of high-frequency characteristics show that, under the same dispersion, the passband of EBTSW-SWS increases by 30% compared to the SW-SWS, and the average interaction impedance of EBTSW-SWS is higher than that of SW-SWS in almost the whole passband. Moreover, the particle-in-cell (PIC) simulation results reveal that under the operating voltage of 20.8 kV and beam current of 150 mA, EBTSW-TWT can provide more than 70 W of saturated output power in the frequency range of 200-260 GHz, reaching the maximum power of 151 W at 220 GHz with the maximum electronic efficiency of 4.85%.

Date: 2023
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DOI: 10.1080/09205071.2023.2204407

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