[2] Thumm M, Kasparek W. Passive high-power microwave components [J]. IEEE Trans on Plasma Science, 2002, 30(3): 755-786.
[3] Mobius A W, Casey J A, Kreischer K E, et al. An improved design for Quasi-Optical mode conversion of whispering gallery mode gyrotron radiation [J]. Int.J.Infrared and Millimeter Waves, 1992, 13(8): 1033-1061.
[4] Vlasov S N, Orlova I M. Quasioptical transformer which transforms the waves in a waveguide having a circular cross section into a high directional wave beam [J]. Radiophysics and Quantum Electronics, 1975, 17(1): 115-119.
[6] Denisov G G, Kuftin A N, Malygin V I, et al. 110GHz gyrotron with a built-in high-efficiency converter [J]. Int. J. Electron, 1992, 72(5-6): 1079-1091.
[7] Jin J B, Thumm M, Piosczyk B, et al. Theoretical investigation of an advanced launcher for a 2-MW 170-GHz TE34,19 coaxial cavity gyrotron [J]. IEEE trans. Microwave Theory and Tech. 2006, 54(3): 1139-1145.
[8] Thumm M, Yang X K, Arnold A. A high-efficiency quasi-optical mode converter for 1 140-GHz 1-MW CW gyrotron [J]. IEEE trans. Electron Device. 2005, 52(5): 818-824.
[10] XU Xi-Shou, WANG Bin, GENG Zhi-Hui, et al. Study of a Quasi-Optical Mode Converter for W-band Gyrotron Oscillator [J]. IEEE Trans. Plasma Sci. 2011, 39(12): 3345-3350.
[12] Blank M, Kreischer K, Temkin R. Theoretical and experimental investigation of a quasi-optical mode converter for a 110-GHz gyrotron [J]. IEEE Trans on Plasma Science, 1996, 24(3): 1058-1066.