S波段1kW连续波磁控管拓展注入锁频带宽

Inject-locking bandwidth expansion of a 1 kW Continuous Wave magnetron at S-band

注入锁频技术是实现多只磁控管相干功率合成的关键技术.对S 波段1 kW 连续波磁控管输出信号频谱的改善进行研究,分析了灯丝电流对磁控管输出特性的影响,通过降低灯丝电流使磁控管自由振荡下的输出微波频带宽度由10 MHz 降低至300 kHz.通过提高参考信号的注入功率,有效地拓展了连续波磁控管的注入锁频带宽,最终获得了高达14 MHz 的注入锁频带宽.在不同注入功率比的情况下,该连续波磁控管的外观品质因数QE 为52-72.

The inject-locking on a magnetron is a key technique to achieve coherent power combining to extend the power capacitance of magnetrons. The improvement on the output spectrum of a 1 kW Continuous Wave(CW) magnetron at S-band is presented. The influence of the filament current on output characteristics of the magnetron is studied. The bandwidth of the free oscillating magnetron is reduced from 10 MHz to 300 kHz by decreasing its filament current. The inject-locking bandwidth of the CW magnetron has been expanded to 14 MHz by increasing the injection signal power. The External Quality Factor(QE) of the magnetron evaluated from the Adler equation varies from 52 to 72 at various injecting power ratios.