Design and Test of a Novel Broadband Circular Waveguide TE <sub>31</sub> Mode Converter
ABSTRACT In order to meet the cold testing requirements of high‐frequency systems for gyrotron travelling wave tube (Gyro‐TWT), a novel broadband circular waveguide TE 31 mode converter is designed and verified in this letter. The designed mode converter adopts a power‐divider waveguide network with twisted waveguides to realise efficient broadband conversion from rectangular waveguide TE 10 mode to circular waveguide TE 31 mode. Simulation results demonstrate that the proposed circular waveguide TE 31 mode converter exhibits an input port return loss better than 21 dB and an insertion loss less than 0.11 dB. It realises high conversion efficiency (>97.5%) in a relative bandwidth of 41%. A prototype circular waveguide TE 31 mode converter is fabricated and characterised through back‐to‐back cold‐test and infrared field pattern imaging. The experimental results closely align with the theoretical predictions, with a deviation of less than 0.1 dB between the two values.
Authors
- Yue Zhao (ORCID: https://orcid.org/0000-0001-5116-1101)
- Yanyu Wei (ORCID: https://orcid.org/0000-0002-0737-027X)
- Jinchi Cai (ORCID: https://orcid.org/0000-0001-9328-0053)
- Yong Xu (ORCID: https://orcid.org/0000-0002-9580-4823)
- Luwei Liu (ORCID: https://orcid.org/0000-0001-7692-1787)
- Xingyu Zhou (ORCID: https://orcid.org/0009-0002-9390-8829)
- J.-L. Li
- Ming-Xian Cai
Institutions
- University of Electronic Science and Technology of China (CN)
- Beijing Vaccum Electronic Research Institute (CN)
Publication Details
- Journal
- Electronics Letters
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1049/ell2.70440
- Primary Topic
- Gyrotron and Vacuum Electronics Research
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China