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In this paper, the S parameters of a single coupler are extracted from the whole slow-wave-structure (SWS) system. The basic theory is derived. The simulation model is built up based on the helix SWS in the code CST Microwave Studio. The whole S parameters of the system are simulated. The parameters of a single coupler are obtained from the whole parameters based on the derived theory. The results...
In this paper, the ridge-loaded helix slow-wavestructure (SWS) used in microwave power module (MPM) is presented. Based on the finite vane model, the loaded ridge and the support rod in ridge are equalized to the sector waveguides with regard to the helix tape thickness. The dispersion characteristic equation is newly derived. The calculation results meet the measurements very well.
In this paper, the coupler of the traveling-wave tube (TWT) is designed to be used in microwave power module (MPM). The stepped-impedance technology is employed to minimize the size. The length is decreased to about one half. The simulation results meet the measurements very well.
The high frequency characteristics have been researched on overmoded traveling-wave tube (TWT) at W-band. A new slow-wave structure (SWS) is presented. The high frequency parameters including dispersion, interaction impedance, and cold loss are calculated using the 3-D full wave simulation tool CST MWS. The new structure is working at the fourth mode with the frequency of 100.5 GHz. The cross-section...
In this paper, the TWT nonlinear equations are newly derived by considering the higher harmonics. The nonlinear process is also simulated by the Russian simulation code TWTSNU. Compared with the simulations, the derivations of this paper have the discrepancy of about 2%, while the old equations of about 10%. Also, it can be clearly seen from this paper that the output power of fundamental harmonic...
The electrical and thermal characteristics have been researched on overmoded traveling-wave tube (TWT) at W-band. A new slow-wave structure (SWS) is presented. The beam-wave interaction is calculated using the 1-D large signal simulation tool TWTSNU. The results show the new structure is working at the fourth mode with the average output power 1.25 kW, electronic efficiency 17.8%, and stable thermal...
This paper describes the investigation of broadband interaction and harmonic suppression. A special dispersion shape used in broadband traveling-wave tubes (TWT) is obtained. The and simulation studies of negative dispersion are presented. On the basis of these studies, a broadband TWT used in microwave power module (MPM) is designed. Compared with the old TWT with flat dispersion, the new one with...
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