[1] Siegel P H, IEEE Transactions on Microwave Theory& Techniques 52, 2438 (2004).
[2] Y. M. Shin, A. Baig, L. R. Barnett, W. C. Tsai and N. C. Luhmann, IEEE Trans. Electron Devices 59, 234 (2012).
[3] H. Gong, Y. Gong, T. Tang and J. Xu, IEEE Trans. Electron Devices 58, 2159 (2011).
[4] Nusinovich G S, Cooke S J, Botton M and Levush B, Physics of Plasmas 16, 853 (2009).
[5] E. P. Dean, T. N. Khanh and K. A. David, IEEE Trans. Electron Devices 61, 1637 (2014).
[6] M. Field, Z. Griffith, A. Young and C. Hillman, Development of a 220 GHz 50 W Sheet Beam Travelling Wave Tube Amplifier, IEEE International Vacuum Electronics Conference, 225 (2014).
[7] Kory C L, Read M, Ives R L, Booske J and Borchard P, IEEE Trans. Electron Devices 56, 713 (2008).
[8] K. E. Kreischer, J. C. Tucek, M. A. Basten and D. A. Gallagher, 220 GHz Power Amplifier Testing at Northrop Grumman, Vacuum Electronics Conference, 1 (2013).
[9] M. A. Basten, J. C. Tucek, D. A. Gallagher and K. E. Kreischer, G-Band Power Module Development at Northrop Grumman, Vacuum Electronics Conference, 1 (2013).
[10] S. Yan, W. Su, Y. Wang and A. Xu, IEEE Trans. Plasma Science 43, 414 (2015).
[11] S. Yan, W. Su, A. Xu and Y. Wang, Journal of Electromagnetic Waves and Applications 29, 436 (2014).
[12] J. H. Booske, M. C. Converse, C. L. Kory and C. T. Chevalier, IEEE Trans. Electron Devices 52, 685 (2005).