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Demonstration of W-Band 30-W Continuous-Wave Folded Waveguide Traveling Wave Tube with Lowered Operation Voltage and Improved Gain Flatness

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Abstract

We have demonstrated and developed a W-band 30 W continuous-wave folded waveguide traveling wave tube (CW FWTWT) with 13.5-kV operation voltage and 4.8 dB gain flatness. In this paper, we quantitatively study the relationship between operating voltage and the key geometric dimensions of a folded waveguide, which is the key to the design of the low-voltage TWT. In addition, problems of improving beam transmission and suppressing oscillations are also studied, and the related design methodologies of the long-range electron gun, periodic permanent magnet (PPM) focusing system, low-voltage standing wave ratio (VSWR) coupling system, and horseshoe attenuator are discussed. On the basis of the above analysis, we have designed and fabricated two types of W-band CW TWTs. The test results show that beam transmissions are over 98.5% at DC and better than 96.5% at the highest peak RF power. Measured saturated output powers are greater than 33.6 W with saturated gain more than 42.2 dB within frequency range of 91–99 GHz, and an improved gain flatness of 4.8 dB is achieved.

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Authors and Affiliations

  1. Aerospace Information Research Institute, Chinese Academy of Science, No.5, Yanqi East 2nd Road, Yanqi Economic Development Zone, HuairouDistrict, Beijing, China

    Fei Li, Liu Xiao, Tianjun Ma, Yuhui Sun, Jiandong Zhao, Jian Wang, Cha Gao, Linlin Cao & Mingguang Huang

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  1. Fei Li
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  2. Liu Xiao
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  3. Tianjun Ma
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  4. Yuhui Sun
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  5. Jiandong Zhao
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  6. Jian Wang
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  7. Cha Gao
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  8. Linlin Cao
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  9. Mingguang Huang
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Correspondence to Fei Li.

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Li, F., Xiao, L., Ma, T. et al. Demonstration of W-Band 30-W Continuous-Wave Folded Waveguide Traveling Wave Tube with Lowered Operation Voltage and Improved Gain Flatness. J Infrared Milli Terahz Waves 41, 1252–1266 (2020). https://doi.org/10.1007/s10762-020-00732-z

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  • DOI: https://doi.org/10.1007/s10762-020-00732-z

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