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加脊圆波导截止波长的计算问题至今仍未见有完整的理论分析和计算方法的介绍,已报导的微扰法等不仅应用局限性大,且准确性欠佳。本文运用修正边界元法,建立了圆波导在任意加脊后截止波长计算的数学模型;推导了圆波导在四种有实际意义的加脊情况下,其截止波长计算的具体公式,最后给出其中两种结构的数值计算曲线,可供微波移相器等加脊圆波导器件的工程设计参考。计算结果说明,文中方法适用性强,模型简单,计算可靠。
Up to now, there has been no comprehensive introduction of theoretical analysis and calculation methods for the calculation of the cut-off wavelength of ridge waveguide. The reported perturbation method has not only the limitation of application but also the poor accuracy. In this paper, the modified boundary element method is used to establish the mathematic model for the calculation of the cut-off wavelength of a circular waveguide after any addition ridge. The formulas for calculating the cut-off wavelength of a circular waveguide under the four practical conditions are given. Finally, One of the two structures of the numerical calculation curve for the microwave phase shifter and other ridge waveguide device engineering reference. The calculation results show that the method has strong applicability, simple model and reliable calculation.