A Ridge-Loaded Sine Waveguide for G -Band Traveling-Wave Tube

• Published in: IEEE transactions on plasma science Vol. 44; no. 11; pp. 2832 - 2837
• Main Authors: Zhang, Luqi, Wei, Yanyu, Guo, Guo, Ding, Chong, Wang, Yuanyuan, Jiang, Xuebing, Zhao, Guoqing, Xu, Jin, Wang, Wenxiang, Gong, Yubin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Beam–wave interaction; Cables; Dispersion; Electromagnetism; Electron beams; Electron tubes; Impedance; Integrated circuit modeling; Metals; Power generation; ridge-loaded sine waveguide (RLSWG); Simulation; terahertz; traveling-wave tube (TWT)
• ISSN: 0093-3813; 1939-9375
• DOI: 10.1109/TPS.2016.2605161

A novel slow-wave structure (SWS), named ridge-loaded sine waveguide (RLSWG), has been proposed to develop the wideband high-power terahertz traveling-wave tube (TWT). The slow-wave characteristics of the RLSWG SWS, including dispersion properties and interaction impedance, are analyzed by using the 3-D electromagnetic simulation software Ansoft high frequency structure simulator (HFSS). From our calculation, the average interaction impedance of the RLSWG SWS at 0.22 THz is 42.2% higher than the conventional SWG SWS. Meanwhile, the simulation results demonstrate that the RLSWG SWS possesses low ohmic losses and reflection. Moreover, the particle-in-cell (PIC) simulation results reveal that, with the cylindrical electron beam of 20.9 kV and 45 mA, the output power and electron efficiency of the RLSWG TWT at the typical frequency of 0.22 THz can reach 52.1 W and 5.54%, respectively. In addition, the 3-dB bandwidth of the RLSWG TWT exceeds 25 GHz. Compared with the SWG TWT, the RLSWG TWT has the shorter tube length and can generate the larger output power.