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对目前慢波结构的模拟计算中存在的问题进行了深入分析,并提出了新的计算耦合阻抗的方法。研究了圆波导梳状慢波结构基波的耦合阻抗,其值可以在较宽频带内大于1Ω。该结构内孔径为波长的1/4~1/3,是同一频段螺旋线慢波结构的5倍左右,能容纳比螺旋线大25倍的电流,能够承受比螺旋线大25倍的平均功率。互作用计算表明采用这种慢波结构的行波管在Ka波段可获得的最高功率达170 kW。
The problems existing in the simulation of the current slow-wave structure are analyzed in depth, and a new method for calculating the coupling impedance is proposed. The coupling impedance of the fundamental wave of the circular waveguide comb-shaped slow-wave structure is studied, and its value can be greater than 1Ω in a wider frequency band. The inner diameter of the structure is 1/4 to 1/3 of the wavelength, which is about 5 times of the helical slow wave structure in the same frequency band, can accommodate 25 times larger current than the helix, and can bear the average power 25 times larger than the helix . Interaction calculations show that the maximum power available for the traveling wave tube with this slow-wave structure in the Ka band is 170 kW.