圆波导梳状慢波结构的耦合阻抗
Coupling impedance of circular waveguide comb slow wave structure
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摘要: 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。Abstract: 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
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Key words:
- circular waveguide comb /
- slow wave structure /
- coupling impedance /
- traveling wave tube
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