Corresponding to the atmospheric transmission windows of the electromagnetic spectrum in the low terahertz range, the mode coupling and dispersion characteristics of two helically corrugated waveguides (HCW) in the frequency ranges of 90 GHz–100 GHz and 260 GHz–265 GHz are studied. Through analytic calculations and numerical simulations, dispersion curves and structural parameters of the two frequency ranges waveguides are obtained. A novel method was proposed to obtain the dispersion of the HCW from the eigenwave solution using a periodic boundary condition. The HCW in a frequency range of 90 GHz–100 GHz was fabricated and its dispersion performance was measured. By comparing the measured results with the theoretical and the simulated results, the validity of the analytical and simulation method is verified. Limited to our machining capability, the dispersion of the 260 GHz–265 GHz HCW was only simulated and calculated and it was found that the results agree well with each other.

对应于低太赫兹范围内电磁频谱的大气传输窗口，研究了两个螺旋波纹波导（HCW）在90 GHz–100 GHz和260 GHz–265 GHz频率范围内的模式耦合和色散特性。通过解析计算和数值模拟，获得了两个频率范围波导的色散曲线和结构参数。提出了一种使用周期性边界条件从本征波解中获得HCW色散的新方法。制作了90 GHz–100 GHz频率范围内的HCW，并测量了其色散性能。通过将测量结果与理论和仿真结果进行比较，验证了分析和仿真方法的有效性。限于我们的加工能力，