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Abstract
A novel folded-wave guide (FWG) slow-wave structure (SWS) with sheet-beam tunnel is presented for the high-power and considerable bandwidth in terahertz (THz) wave band. Its electromagnetic characteristics and nonlinear interaction between the electron beam and the electromagnetic field were investigated. A novel input and output coupler was proposed that could produce good input and output matches. The particle-in-cell simulation results revealed that the tube can be expected to produce over 100 W of average power in the range from 141 to 146 GHz, assuming an RF input signal with an average power of 45 mW. Compared with the conventional folded-waveguide traveling-wave tube (FWGTWT) at 140 GHz, the novel FWGTWT had a 48% higher output power, and the novel FWGTWT can operate at same frequency band with larger dimensional parameters. Meanwhile, the novel FWG was also much shorter than the normal FWG with good performance at the working frequencies. It, therefore, will favor the miniaturized design of a high-power terahertz wave band traveling-wave tubes (TWT).
Acknowledgements
This work was supported in part by the National Science Fund for Distinguished Young Scholars of China under Grant No. 61125103 and in part by the National Natural Science Foundation of China under Grant No. 60971038.