讨论了三间隙耦合腔输出结构中各模式的谐振频率特性,分析了耦合系数对模式重叠过程的影响。以X波段为例,模拟计算了输出结构的群时延特性,研究了输出结构工作的稳定性。结果表明,在带内波动约1.7 dB的条件下,采用三模重叠,可获得6.61%的瞬时带宽,具有良好的稳定性。 The resonant frequency characteristics of each mode in the three-gap coupled cavity output structure are discussed, and the influence of the coupling coefficient on the mode overlap process is analyzed. Taking the X band as an example, the group delay characteristics of the output structure are simulated and the stability of the output structure is studied. The results show that the in-band fluctuations of about 1.7 dB under the conditions of the use of three-mode overlap, you can get 6.61% of the instantaneous bandwidth, with good stability.