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Tian, Yanyan; Shu, Guoxiang; Gong, Yubin; Yin, Huabi; He, Wenlong
IEEE transactions on electron devices, 02/2023, Letnik: 70, Številka: 2Journal Article
In this article, a folded waveguide with two coupling grooves is proposed for high-power and high-frequency traveling wave tubes (TWTs). The structure allows a modified TE20 high-order mode interact with two sheet electron beams. The transmission characteristics of this novel structure were simulated and measured. A good <inline-formula> <tex-math notation="LaTeX">{S}_{{21}} </tex-math></inline-formula> of −10 dB and <inline-formula> <tex-math notation="LaTeX">{S}_{{11}} </tex-math></inline-formula> of less than −15 dB were achieved in the 218-230-GHz range. Moreover, simulations of the beam-wave interaction in this structure predicted an output power of 930 W at 220 GHz, with a small signal gain of 58 dB and a 3-dB bandwidth of 1.3 GHz.
