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A sapphire output window is designed for 108GHz folded waveguide traveling-wave tube (FW-TWT). The voltage standing wave ratio (VSWR) is calculated using CST Microwave Studio (MWS). The transmission modes in the window are analyzed. Thermal analysis of the output window using ANSYS package is presented. With different power losses in the window, temperature, total deformation and equivalent stress...
Enhance the efficiency of beam-wave interaction is an important problem in the design of folded waveguide traveling-wave tube (TWT) amplifier. A dielectric-loaded tapered folded waveguides was studied, whose equivalent circuit analysis is mainly introduced in this paper.
The paper presents a novel cascaded folded waveguide traveling wave tube (FW-TWT) interacting with two beams operating at TE20 mode. This cascaded structure is constructed by two sections. The downstairs section interacts with the two beams to amplify the signal initially. It also provides the upstairs section with small input power. The upstairs section continues to amplifying the signal. Both the...
A 340GHz two-beam folded waveguide (FW) traveling wave tube (TWT) is performed in the paper. The nonlinear beam-wave interaction in the TWT is investigated by the use a Particle-in-cell simulation code CHIPIC. The output power versus different beam current is calculated. Moreover, the effect of the distance between the two beam holes on the output power is also analyzed. The truncation and attenuation...
The paper designs the structural parameters of 340GHz folded waveguide traveling wave tube (FW-TWT) according to the dispersion relation and interaction impedance. To valid the primary design, the cold-circuit properties were also calculated by electromagnetic software (CST MWS) simulation. The results show that the interaction impedance is 1.95ohm at 340GHz. The CST particle-in-cell solver was applied...
Two beams are introduced into the folded waveguide (FW) slow wave structure. The transmission modes in the longitudinal and transverse two-beam FW were compared. The dispersion of longitudinal and transverse two-beam FW was calculated by CST Microwave Studio (MWS). The results of simulation show that the transverse two-beam FW has wider bandwidth than the longitudinal two-beam FW. The S parameter...
In this paper, an equivalent circuit model is adopted to research on the dispersion characteristics of terahertz (THz) two-beam folded waveguide (FW). Firstly, two different equivalent circuit models of beam holes are compared. Secondly, the results from HFSS and CST Microwave Studio (MWS) are compared with above results. Besides, some improvements on the equivalent circuit model are conducted to...
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