Theoretical and Experimental Investigations of a G-Band Wideband TE <sup></sup> <sub>02</sub> Mode Converter and a Meta-Surface Window for Gyro-TWTs

In this article, a wideband TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>2. mode converter and a beryllium oxide (BeO) meta-surface dielectric window are investigated theoretically and experimentally. The proposed mode converter consists of three-mode conversion sections (TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>4.–TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>6., TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>8.–TE<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">×</sup><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">44</sub> and TE<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">×</sup><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">44</sub>–TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>12.) and two transition sections. (<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>14. represents the rectangular waveguide, <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">×</sup> represents the cross waveguide, and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>17. represents the circular waveguide). The test result shows that the transmission of the TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>19.–TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>21. mode converter is around –2 dB from 170 to 260 GHz with a relative bandwidth of 41.9%. The measured reflection coefficient is basically below –10 dB. The fabricated BeO meta-surface window has a relative bandwidth of 30.4% with the reflection below –20 dB from 170 to 231 GHz. Simulation results agree well with experimental results when the conductor loss, machining errors, and assembling errors are taken into account.

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Publication Details

Journal
IEEE Transactions on Electron Devices
Published
2025-06-24
DOI
https://doi.org/10.1109/ted.2025.3580010
Primary Topic
Gyrotron and Vacuum Electronics Research
Type
article
Field-Weighted Citation Impact
0.00

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article

Theoretical and Experimental Investigations of a G-Band Wideband TE 02 Mode Converter and a Meta-Surface Window for Gyro-TWTs

Peisheng Liang, Zhi Yi, Yubin Gong, Yanyu Wei et al.
IEEE Transactions on Electron Devices
Gyrotron and Vacuum Electronics Research
article

Theoretical and Experimental Investigations of a G-Band Wideband TE 02 Mode Converter and a Meta-Surface Window for Gyro-TWTs

Peisheng Liang, Zhi Yi, Yubin Gong, Yanyu Wei, Na Yao, Diwei Liu, Kaichun Zhang, Taotao Mao, Tao Song, Xu Qi, Chen Zhang, Wei Wang, Ke Chen, Zhenhua Wu, Yuxuan Chai, Jiao Jiao, Meihang He, Chenghui Zhu
article en

Abstract

In this article, a wideband TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>2. mode converter and a beryllium oxide (BeO) meta-surface dielectric window are investigated theoretically and experimentally. The proposed mode converter consists of three-mode conversion sections (TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>4.–TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>6., TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>8.–TE<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">×</sup><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">44</sub> and TE<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">×</sup><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">44</sub>–TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>12.) and two transition sections. (<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>14. represents the rectangular waveguide, <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">×</sup> represents the cross waveguide, and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>17. represents the circular waveguide). The test result shows that the transmission of the TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>19.–TE<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\text{\fontsize{5}{7}\selectfont{$</tex-math></inline-formula>21. mode converter is around –2 dB from 170 to 260 GHz with a relative bandwidth of 41.9%. The measured reflection coefficient is basically below –10 dB. The fabricated BeO meta-surface window has a relative bandwidth of 30.4% with the reflection below –20 dB from 170 to 231 GHz. Simulation results agree well with experimental results when the conductor loss, machining errors, and assembling errors are taken into account.

IEEE Transactions on Electron DevicesVol. 72(8)
University of Electronic Science and Technology of China (CN), Naval University of Engineering (CN)
National Natural Science Foundation of China, Natural Science Foundation of Sichuan Province, Foundation for Science and Technology
Openalex Percentile: Top 89%
Gyrotron and Vacuum Electronics Research
DOISourceOpenAlex
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