S波段大功率注入锁频磁控管的输出特性

Injection frequency locking technology of S-band high power magnetron

在多路注入锁频大功率连续波磁控管的相干功率合成实验中,输出特性分析有利于提升合成效率。搭建了一款S波段20kW连续波磁控管注入实验系统,该系统包含幅频可调的微波源和移相器,由磁控管信号发生系统、注入锁定系统以及相位差检测系统3个小系统组成。利用外部注入信号,分别对磁控管输出信号的相位稳定度、频谱和相位噪声进行实验分析,实现了对实际磁控管在外部注入前后的特性分析。其中,相位差波动最小不足4°,最大17°,锁频带宽在2.9~13MHz之间变化,在偏移频率1MHz内对相位噪声抑制超过40dB;并对注入锁频信号与输出信号之间的关系进行了总结,为多路大功率磁控管的功率合成提供理论依据。

In the coherent power combing experiment of multi-channel injection-locking of highpower continuous wave magnetron,the analysis on the output character can improve the combing efficiency.An injection-locking system of a 20 kW continuous wave magnetron at S-band is built,which is composed of three small systems:a magnetron signal generating system,an injection locking system and a phase difference detecting system.There are a microwave frequency source and a phase shifter with adjustable amplitude and adjustable frequency in the system.Using the external injection signal,the phase stability,spectrum and phase noise of the output signal of the magnetron are analyzed respectively.The minimum phase difference fluctuation is less than 4°,the maximum is 17°,the locking frequency band varies between 2.9 MHz and 13 MHz,and the phase noise suppression is over 40 dB.The relationships between the injection locking signals and the output signals are also summarized,which lays a foundation for the power combing of magnetrons.