In view of the higher computation accuracy of the attenuation standard of cutoff waveguides, the discussion of this paper paid more attention to the cutoffregion.
鉴于截止波导衰减标准的计算精确度要求很高，本文的讨论重点放在截止区。
2
The cutoff wavelength of the rectangular coaxial waveguide in the coupling region is calculated by boundary element method.