P2-8: The influence of the high-frequency parameter on harmonic of traveling-wave tube

High-frequency parameter determines the output power and gain characteristics of a traveling wave tube. The relationship between the harmonics and the fundamental parameters determines the harmonic and fundamental proportion of the output power. Within a relatively broad range of parameter variation, the impacts on second harmonic from the distribution of phase velocity and coupling impedance are compared. We conclude that when the phase velocity proportion of harmonic to fundamental wave is approximately 0.96, the harmonic wave reaches its peak value. The higher proportion of coupling impedance is, the greater harmonic is.