Improvements in a 20-kW Phase-Locked Magnetron by Anode Voltage Ripple Suppression

Microwave devices based on high-power magnetrons are currently used widely and there is a strong demand for phase-controlled magnetrons. In this work, the performance of a 20-kW $S$ -band continuous-wave magnetron with varied anode voltage ripple is studied. The anode voltage ripple is introduced to an equivalent model of the magnetron to evaluate the system& x2019;s performance theoretically. The effects of the anode voltage ripple and the injection parameters on the magnetron& x2019;s output are thus analyzed numerically. Furthermore, experiments are performed while the anode voltage ripple is varied from 4.2& x0025; to 0.6& x0025; using a shunt capacitance-adjustable ripple filter module. A nearly tripled locking bandwidth is observed under a constant injection ratio at 0.1 with decreasing ripple. The ripple-suppressed system pulls its sideband energy to the locking frequency and thus achieves a spectral intensity increment of 0.9 dB, phase noise reduction of 13 dB at an offset of 100 kHz, and phase jitter convergence from & x00B1;1.8& x00B0; to & x00B1;0.9& x00B0;. The experimental features validate the results obtained from the theoretical analyses. The results of this investigation also provide guidance for future industrial applications of phase-locked magnetron arrays.