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Journal of Electromagnetic Waves and Applications Volume 38, 2024 - Issue 11
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Letter to the Editor

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

Zheng Changa National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaView further author information
,
Zhigang Lua National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaCorrespondence[email protected]
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Peng Gaob School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaCorrespondence[email protected]
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Jingrui Duana National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaView further author information
,
Xiaofan Guia National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaView further author information
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Zhenting Zhenga National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaView further author information
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Zhanliang Wanga National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaView further author information
,
Shaomeng Wanga National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaView further author information
&
Yubin Gonga National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaView further author information
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Pages 1209-1219 | Received 24 Mar 2024, Accepted 21 May 2024, Published online: 07 Jun 2024
 
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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.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was financially supported by the National Natural Science Foundation of China under Grants 62071087, 61921002, 92163204, and 61988102 and in part by the Sichuan Science and Technology Program under Grant 2023NSFSC0452.

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