磁控管自由振荡带宽对其注入锁定带宽的影响研究

Effect of Free-running Magnetron Spectrum on Injection-locking Bandwidth

自由振荡磁控管的输出信号通常具有一定的带宽,而非理想的单频信号;文章研究了磁控管自由振荡输出带宽对其注入锁定的影响。从统计上认为自由振荡磁控管的输出频率服从正态分布,结合注入锁定理论,计算了磁控管在不同注入频率下的输出频谱。理论分析表明:当考虑自由振荡磁控管输出频谱具有一定带宽时,峰值频率牵引带宽将大于理想单频假设下的锁定带宽;随着自由振荡带宽的增加,峰值频率牵引带宽增加,锁定带宽减小。磁控管注入锁定实验结果表明:自由振荡带宽(3 dB)分别为0.375、1.049 MHz时,其锁定带宽分别为8.4、7.9 MHz,峰值频率牵引带宽分别为10.2、13.9 MHz,验证了理论的正确性。本研究发展了磁控管注入锁定理论。

The output signal of a free-running magnetron usually has a certain bandwidth,rather than an ideal single frequency signal.The effect of the spectrum of a free-running magnetron on injection locking is studied.Statistically,it is believed that the output frequency of a free-running magnetron follows a normal distribution.Combined with injection locking theory,the output spectrum of the magnetron at different injection frequencies is calculated.Theoretical analysis shows that when considering the output spectrum of a free-running magnetron with a certain bandwidth,the bandwidth of peak frequency variation will be greater than the locking bandwidth under the ideal single frequency assumption.As the free-running bandwidth increases,the bandwidth of peak frequency variation increases and the locking bandwidth decreases.The experimental results of magnetron injection locking show that when the free-running bandwidth(3dB)is 0.375 MHz and 1.049MHz,the locking bandwidth is 8.4 MHz and 7.9MHz,and the bandwidth of peak frequency variation is 10.2 MHz and 13.9MHz,respectively,which verifies the correctness of the theory.This study develops the magnetron injection locking theory.