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利用三维电磁场程序CST-MWS及高频结构的场对称性计算模型,对毫米波行波管梯形高频慢波结构进行了场结构的数值模拟和设计研究,给出了该系统的冷测色散特性、耦合阻抗及衰减等参数结果。首先选用Huges公司试验样管参数进行了模拟计算的校验,计算结果与Huges发表的测试和理论分析结果完全吻合,理论分析的计算结果甚至略好。然后利用程序分别分析计算了Ka波段的串联式、单交错及双交错结构的梯形耦合腔色散特性、耦合阻抗及衰减系数等与频率的有关变化特性,并进行了比较。结果表明,采用单(双)交错结构显著提高了耦合腔高频慢波系统的频率带宽度和耦合阻抗。
Based on the field symmetry calculation model of three-dimensional electromagnetic field CST-MWS and high-frequency structure, the numerical simulation and design of the field structure of the millimeter-wave trapezoidal trapezoidal high-frequency slow-wave structure are carried out. Characteristics, coupling impedance and attenuation parameters results. First of all, the parameters of Huges test tube were selected to verify the simulation calculation. The calculation results are in good agreement with the results of the test and theoretical analysis published by Huges, and the theoretical analysis results are even slightly better. Then, the program was used to analyze and calculate the characteristics of dispersion, coupling impedance, attenuation coefficient and other characteristics of the trapezoidal coupling cavity of series, single and double staggered structures in Ka band separately and compared with each other. The results show that the frequency band width and the coupling impedance of the coupled cavity high-frequency slow-wave system are significantly improved by using single (double) staggered structure.