提出脊加载同轴交错圆盘波导慢波结构,并用电磁场仿真软件HFSS对其色散特性和耦合阻抗进行了计算，分析了不同结构参数对其高频特性的影响。研究表明：脊加载同轴交错圆盘波导有较好的色散特性，它比非同轴结构的带宽有明显增加，同时可以降低慢波结构的相速，用作行波管慢波结构时可以降低工作电压。脊加载同轴交错圆盘波导是一种全金属结构，散热性能好,损耗低，在毫米波及亚毫米波段的行波管中有较好的应用前景。

For the first time, the coaxial interlaced ridge-disk-loaded waveguide as slow-wave structure is presented, the software HFSS is introduced to simulate and calculate dispersion relation and coupling impedance. It is found that the change of structure parameter affects the high frequency characteristics. The results indicate that the coaxial interlaced ridge-disk-loaded waveguide could get a very weak dispersion and its bandwidth is better than non-coaxial disk loaded waveguide. Meanwhile the coaxial interlaced ridge-disk-loaded waveguide has lower phase velocity than other coaxial structure. When it is used as the slow-wave structure of the traveling wave tube, the operating voltage decreases. Because the coaxial interlaced ridge-disk-loaded waveguide is a new all-metal structure with the advantage of high power capability and lower losses, it has a large potential application in millimeter and sub-millimeter wave traveling-wave tubes.