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建立了自洽的考虑波导璧损耗的折叠波导等效电路模型,用来计算该慢波结构周期TE10模式中各次空间谐波的相速度,耦合阻抗和线衰减系数.分析结果将会用到220 GHz折叠波导返波管一维束波互作用模型的计算中.当微波频率上升到太赫兹波段时,粗糙波导表面电流导致的壁损将不能再忽略不计.进一步研究表明,起振电流和输出功率水平将和损耗特性的计算密切相关.从原有模型发展而来的有损电路模型可以给出更准确损耗估计.建立了折叠波导慢波线三维谐振腔模型来验证本文的等效电路理论,有较好的吻合.采用了该理论导出参数的一维束波互作用模型和三维数值PIC方法同样有很好的一致性.
A self-consistent folded waveguide equivalent circuit model considering waveguide loss is established to calculate the phase velocity, coupling impedance and line attenuation coefficient of each spatial harmonic in the TE10 mode of the slow-wave structure. The analysis results will be used When the microwave frequency rises to the terahertz wave band, the wall loss due to the surface current of the rough waveguide can no longer be neglected. Further studies show that the sum of the starting current and The output power level will be closely related to the calculation of loss characteristics.The lossy circuit model derived from the original model can give a more accurate estimation of loss.A three-dimensional folded-waveguide slow-wave mode resonant cavity model is established to verify the equivalent circuit Theory, there is a good agreement.Using this theory to derive parameters of the one-dimensional beam interaction model and the three-dimensional numerical PIC method also has a good consistency.