矩形螺旋线慢波电路高频特性的数值分析  

Numerical Analysis of High-Frequency Characteristics of Rectangular Helical Slow-Wave Circuits

作　　者：付成芳[1] 魏彦玉[1] 宫玉彬[1] 王文祥[1] 

机构地区：[1]电子科技大学物理电子学院,成都610054

出　　处：《真空科学与技术学报》2009年第4期386-390,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金重点资助课题(No.60532010);国家自然科学基金资助课题(No.60401005)

摘　　要：介绍了用ANSOFT公司提供的HFSS 10.0软件模拟计算色散特性和耦合阻抗的理论方法,并对矩形螺旋线慢波结构的高频特性进行了数值模拟。结果表明:和传统的圆螺旋线结构相比,矩形结构具有更高的耦合阻抗,能有效减小器件体积;在横截面厚度和螺旋角一定的情况下,当矩形螺旋线的宽高比大于4时,相速几乎不变,但是耦合阻抗随着宽度的增加而下降;同时螺旋角的减小可以降低系统的相速,减小工作电压。由于可利用微电子机械系统(MEMS)印制技术制作,具有可与带状电子束作用,提高效率等优点,矩形螺旋线在紧凑型行波管(TWT)领域有广阔的应用前景。The high-frequency characteristics, including its dispersion characteristics and its coupling impedance, of rectangular helical slow-wave circuits, were simulated with the software package HFSS10.0 provided by ANSOFT. The simulated results show that the rectangular helical slow-wave structure has higher coupling impedance, smaller size in a traveling wave tube（TWT） than that of a circular one. Moreover, at the given height and helix pitch, when the height/width ratio of the rectangular helical slow-wave structure is greater than 4 i. e. b/a 〉 4, the phase velocity remains unchanged. However, the coupling impedance decreases with an increase of its width. In addition, the phase velocity and the operating voltage can be favorably decreased by reducing the pitch angle. The rectangular helical slow-wave structure has wide applications in printed compact TWT because of its strengths, such as its compatibility to micro electro-rneehanieal system （MEMS）technology, its capability of coupling with a sheet beam to improve the efficiency.

关 键 词：矩形螺旋线 慢波系统 色散特性 耦合阻抗 计算机仿真 

分 类 号：TN124[电子电信—物理电子学]