圆波导梳状慢波结构的耦合阻抗

 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1 W。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。

Coupling impedance of circular waveguide comb slow wave structure

In this paper the coupling impedance of circular comb slow wave structure is investigated in detail. Some problems in the computer simulation for interaction impedance are investigated, and a new method for the calculation of interaction impedance is proposed. The study leads to the conclusion that the circular comb slow wave structure has an impedance over 1 W at its fundamental mode within a relatively wide band and may interact with the beam effectively. Besides, the inner radius of the structure is 1/4~1/3 times the wavelength, and 5 times larger than that of a helix, implying 25 times of beam current and 25 times of average power compared to a helix. Calculation of interaction shows that a traveling wave tube in Ka band with maximum power of 170 kW may be realized using this kind