[8] Li K, Liu W X, Wang Y, et al. Dispersion characteristics of two-beam folded waveguide for terahertz radiation[J]. IEEE Trans. Electron Devices, 2013, 60:4252-4257.
[12] Liu W X, Zhao C, Li K, et al. Two-section folded-waveguide slow-wave structure for terahertz extended interaction oscillator[J]. IEEE Trans. Electron Devices, 2014, 61(3):902-908.
[14] Kreischer K E, Tucek J C, Basten M A, et al. 220 GHz power amplifier testing at northrop grumman[J]. IEEE, 2013,1-2.
[15] Joye G D, Cook A M, Calame J P,et al. Demonstration of a high power, wideband 220-GHz traveling wave amplifier fabricated by UV-LIGA [J]. 2014, 61(6), 1672-1678.
[18] Li K, Liu W X, Wang Y, et al. A nonlinear analysis of the terahertz serpentine waveguide traveling-wave amplifier[J]. Physics of Plasmas, 2015, 22:043115-1-9.