Methods to improve the phase stability of high-power TWTA

In this paper, the main factors influencing phase stability of traveling-wave tube amplifiers have been analyzed. Some efficient methods to improve phase stability of traveling-wave tube amplifiers have been presented. These methods include selecting an optimized power supply circuit, improving voltage stability of the cathode using a high-frequency and high-voltage power supply with charging capacitor in low-voltage circuit, compensating phase instability resulting from top fall of cathode voltage pulse by adjusting the modulating pulse amplitude, stabilizing the phase with automatic phase control system.