Design, fabrication and cold test of a high efficiency folded groove waveguide for w-band sheet beam TWT
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1.Free Electron Terahertz and Nanobeam Laboratory Shenzhen University, Shenzhen 518000, China;2.School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China;3.Ceyear Technologies Co., Ltd, Qingdao 266400, China;4.Nanjing Sanle Electronic Group Co., Ltd;5.Nanjing 210008, China

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Supported by the National Natural Science Foundation of China (62001297, 61921002 and 61988102) and Shenzhen Science and technology (JCYJ 2020019105415835 and KQTD 20200820113046084)

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    Abstract:

    In this paper, a design, fabrication and cold test of a high efficiency folded groove waveguide (FGW) for w-band (85~110GHz) sheet beam traveling wave tube (TWT) is proposed. One stage phase velocity taper (OSPVT) was used in the FGW to enhance the electronic efficiency of a millimeter-wave sheet beam TWT. The OSPVT was realized via a change of the period of the FGW. Three FGWs with and without OSPVT were fabricated and their measured s-parameters demonstrate good transmission characteristics and wide bandwidth. Moreover, wave dispersions and phase velocities of the unchanged and OSPVT FGWs were obtained from measured transmission phases. 3-D particle-in-cell simulations of beam-wave interaction predicted that the proposed TWT with an OSPVT of twenty half periods could output a saturated power of 240 W at 95 GHz, which is about 70 W higher than the case of without OSPVT. Meanwhile, the application of the OSPVT improves the electronic efficiency in the whole operating frequency range of 85~110 GHz, with a maximum efficiency enhancement of about 47% in the vicinity of 95 GHz.

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TIAN Yan-Yan, WANG He-Xin, SHI Xian-Bao, LI Xin-Yi, GONG Yu-Bin, HE Wen-Long. Design, fabrication and cold test of a high efficiency folded groove waveguide for w-band sheet beam TWT[J]. Journal of Infrared and Millimeter Waves,2022,41(1):274~279

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History
  • Received:July 09,2021
  • Revised:January 18,2022
  • Adopted:August 09,2021
  • Online: January 17,2022
  • Published: