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Performance Evaluation and Experimental Study of a 0.34-THz Folded Waveguide Sheet Beam BWO

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Abstract

Terahertz (THz) backward wave oscillators (BWOs) hold immense potential for a broad range of industrial and military applications. This study presents a comparative analysis of 0.34 THz sheet beam (SB) and circular beam (CB) folded waveguide (FWG) BWOs. We examined the design, simulation (CST MWS and PS, HFSS), and performance, revealing that sheet beam BWO outperforms circular beam BWO in terms of interaction impedance, power, efficiency, and bandwidth. Under 20 kV beam voltage and 10 mA beam current conditions, sheet beam BWO achieves 0.47 \(\Omega \) (0.34 THz) interaction impedance, 0.65 W output power, and a bandwidth of approximately 12 GHz, surpassing the 0.18 \(\Omega \), 0.23 W, and 8.5 GHz values of circular beam BWO, respectively. Furthermore, this study encompasses the fabrication and thorough characterization of the sheet beam BWO’s slow-wave structure. Experimental validation confirms its effectiveness, with measured \(S_{11}\) demonstrating reflection below \(-\)10 dB and \(S_{21}\) exhibiting transmission above \(-\)2 dB.

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Any interested person or party can access the relevant data of this research by contacting Mr. Jibran via his email.

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Funding

This work is supported by the National Natural Science Foundation of China under (Grant Nos. 61531010, 61371052, and 61871095) and by the Key R &D Program of Guangdong (Grant No. 2021B0101300003) and the National Key Research and Development Program of China (Grant No. G072022YFF0707602).

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Authors and Affiliations

  1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610051, China

    Jibran Latif, Huarong Gong, Zhanliang Wang, Atif Jameel, Shaomeng Wang & Yubin Gong

  2. Bei**g Vacuum Electronics Research Institute (BVERI), Bei**g, China

    **jun Feng

Authors
  1. Jibran Latif
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  2. Huarong Gong
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  3. Zhanliang Wang
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  4. Atif Jameel
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  5. Shaomeng Wang
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  6. **jun Feng
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  7. Yubin Gong
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Contributions

All authors whose names appear on the submission made substantial contributions to the design, analysis, simulations, and experimentations. Jibran, Huarong, Zhanliang, and Shaomeng wrote the main manuscript text. Atif and **jun prepared figures and Yubin reviewed the simulation and experimental results. All authors reviewed the manuscript. They drafted the work and revised it critically for important intellectual content.

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Correspondence to Jibran Latif.

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The authors declare no competing interests.

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Latif, J., Gong, H., Wang, Z. et al. Performance Evaluation and Experimental Study of a 0.34-THz Folded Waveguide Sheet Beam BWO. J Infrared Milli Terahz Waves 45, 504–520 (2024). https://doi.org/10.1007/s10762-024-00980-3

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