Simulation methods and transmission characteristics of dielectric-coated metallic waveguides from mid-infrared to millimeter waves

The transmission characteristics of dielectric-coated metallic hollow waveguides (DMHW) are simulated by means of Ray Model, Transmission Line Model, and Finite Element Analysis methods. By comparing the simulation results in mid- and far-infrared, terahertz and millimeter wavelength bands, the range of application and deviation analysis of three simulation methods are presented. Limitations of each simulation model are summarized. The optimization methods of structural parameters for the DMHW in various wavelength bands are provided. The loss properties of the DMHW were measured in 2–10 μm infrared wavelength band, 140–220 GHz millimeter wavelength band, and 2.5THz and 4.3THz frequencies. The measured data agree with the simulation results.