Investigation of angular log-periodic folded groove waveguide slow-wave structure for low voltage Ka-band TWT

Hexin Wang; Shaomeng Wang; Zhanliang Wang; Xinyi Li; Duo Xu; Tenglong He; Tao Tang; Huarong Gong; Zhigang Lu; Zhaoyun Duan; Sheel Aditya; Yubin Gong

doi:10.1063/1.5145346

AIP Advances (Mar 2020)

Investigation of angular log-periodic folded groove waveguide slow-wave structure for low voltage Ka-band TWT

Hexin Wang,
Shaomeng Wang,
Zhanliang Wang,
Xinyi Li,
Duo Xu,
Tenglong He,
Tao Tang,
Huarong Gong,
Zhigang Lu,
Zhaoyun Duan,
Sheel Aditya,
Yubin Gong

Affiliations

Hexin Wang: National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Shaomeng Wang: School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang 639798, Singapore
Zhanliang Wang: National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Xinyi Li: Nanjing Sanle Electronic Group Co., Nanjing 211800, China
Duo Xu: National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Tenglong He: National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Tao Tang: National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Huarong Gong: National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Zhigang Lu: National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Zhaoyun Duan: National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Sheel Aditya: School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang 639798, Singapore
Yubin Gong: National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China

DOI: https://doi.org/10.1063/1.5145346
Journal volume & issue: Vol. 10, no. 3
pp. 035030 – 035030-7

Abstract

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In this paper, a novel angular log-periodic folded groove waveguide (ALFGW) slow-wave structure (SWS) has been investigated theoretically and experimentally for application in Ka-band traveling-wave tubes (TWTs). The dispersion relation for the ALFGW is derived analytically, and the dispersion characteristics are calculated for a Ka-band design. The designed SWS is fabricated using oxygen-free-copper that is silver electroplated. The measured cold-test parameters show good agreement with the simulation results, with S21 varying from −2.7 dB to −4.8 dB and S11 better than −13.6 dB over the frequency range of 30–38 GHz. Simulations of beam–wave interactions using a 4850 V and 0.4 A sheet beam with a high aspect ratio of 28:1 indicate an output power of 128 W, corresponding to a maximum gain and electronic efficiency of 18.1 dB and 6.6%, respectively. Due to the log-periodic form, a higher output power, higher efficiency, wider bandwidth, and lower operating voltage are achieved as compared to a TWT based on the conventional folded groove waveguide (FGW) SWS. These results show that the proposed ALFGW SWS has good potential for application in relatively high-power wideband TWTs.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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