中文摘要：

本文基于微扰法求得不同金属镀层空心圆波导中各模式的损耗系数,对金属镀层空芯波导中THz波传输损耗随金属材料、波导结构等参数的变化关系进行了数值模拟.根据数值分析结果,优化设计并拉制了内径为1.1mm的镀银空芯波导,实验测得当THz波的频率为2.5THz时,传输损耗为8.6dB/m,实现了THz波短距离的有效传输.

英文摘要：

Limited by serious material absorption and dispersion in THz wave band,efficient and long distance delivery of THz signal is one of important problems for constructing a compact THz system.Based on the transmission loss coefficient in metal waveguide obtained by perturbation method,the transmission loss properties of THz wave in metal-coated hollow waveguide varying with different metal materials and waveguide structure parameters are simulated.According to the numerical results,an Ag-coated hollow waveguide with inner diameter of 1.1 mm was designed and fabricated,and the transmission loss of THz wave was 8.6 dB /m at frequency of 2.5 THz as found in experiment,which realizes a short distance transmission with ultralow loss in THz region.