Transmission characteristics of hollow dielectric film-coated waveguide for THz radiation

The transmission characteristics of the hollow dielectric film-coated waveguide for THz radiation are theoretically analyzed, and the eigenequation and the mode distribution of the waveguide are obtained. The relationship between attenuation coefficient and the bore diameter of the hollow waveguide is described based on the ray-optics principle. The attenuation coefficient of the dominant mode is less than 1 dB/m when the dielectric material is polyimide and the depth is 0.05 mm, which is far less than that of the same bore diameter metal circle waveguide for THz radiation. The transmission characteristics of the film-coated waveguide is simulated when the frequncy of the electromagnetic wave ranges from 0 to 1 THz, and the attenuation coefficient is less than 0.5 dB/m in the passband of 0