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研究了计算同轴正弦型慢波结构耦合阻抗的方法,以及慢波结构参数变化引起的共振点变化对各次空间谐波振幅的影响。得到了1.6GHz同轴相对论返波振荡器耦合阻抗随其慢波结构参数的变化规律,并与相应的效率模拟结果进行了比较。结果表明在近线性范围内耦合阻抗结果和模拟结果符合得很好。并用表面波理论对两种结果之间存在的误差进行了分析。
The method to calculate the coupling impedance of a coaxial sinusoidal slow-wave structure and the influence of resonance point changes on the amplitude of each space harmonic wave caused by the changes of the parameters of the slow-wave structure are studied. The variation of coupling impedance of the 1.6GHz coaxial relativistic back-wave oscillator with its slow-wave structure parameters was obtained and compared with the corresponding efficiency simulation results. The results show that the coupling impedance results are in good agreement with the simulation results in the near linear range. The surface wave theory is used to analyze the errors existing between the two results.