[4] Thales Electron Device TH4402. www.thalesgroup.com/electrondevices.
[5] Theiss A J, Meadows C J, Montgomery K L, et al. Development of a high average power W-band TWT[C]// Vacuum Electronics Conference, 2008. IVEC 2008. IEEE International. IEEE, 2008:197-198.
[11] Wei Y, Guo G, Gong Y, et al. Novel W-band ridge-loaded folded waveguide traveling wave tube[J]. IEEE Electron Device Letters, 2014, 35(10):1058-1060.
[13] Shin Y M, Barnett L R. Intense wideband terahertz amplification using phase shifted periodic electron-plasmoncoupling[J]. Applied Physics Letters, 2008, 92(9):132.
[15] Zhang L, Wei Y, Guo G, et al. A ridge-loaded sine waveguide for $G$ -band traveling-wave tube[J]. IEEE Transactions on Plasma Science, 2016, 44(11):2832-2837.
[17] Zhang Lu-Qi, Wei Yan-Yu, Xu Jin, et al. A truncated sine waveguide for G-band TWT[C]. IEEE International Vacuum Electronics Conference, London, United Kingdom, 2017:1-2.
[18] Kory C L, Read M E, Ives R L, et al. Design of overmoded interaction circuit for 1-kW 95-GHz TWT[J]. IEEE Transactions on Electron Devices, 2009, 56(5):713-720.
[19] Hu Y, Feng J, Cai J, et al. Design and experimental study of a wide band width W-band folded waveguide continuous-wave TWT[J]. IEEE Transactions on Plasma Science, 2014, 42(10):3380-3386.
