Particle-In-Cell Simulations of Beam-wave Interacion for Sub-Terahertz Folded Waveguide Traveling Wave Tubes

In this paper, we modelled a sub-Terahertz at the frequency of 0.108THz folded waveguide traveling-tube (FWTWT) by utilizing a 3-D particle-in-cell (PIC) in CST STUDIO SUITE, and we investigated the beam and electromagnetic field of 108GHz FWTWT. The process of the interaction for FWTWT are presented, including working voltage, the structural parameters, working frequency. The radiation power and gain of the FWTWT at 108GHz is 42.32W and 26.26dB. The output of the FWTWT changes only 1.2dB across the 7Ghz bandwidth ranging from 103Ghz to 110GHz, which is useful in many fields, such as communications, electronic countermeasures, radar.