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中文摘要：
介绍了用德国CST公司提供的MWS4．2软件模拟计算色散特性和耦合阻抗的理论方法，对内开槽矩形波导栅结构的高频特性进行了数值模拟。结果表明：在传统矩形波导栅结构的基础上，开槽后的矩形波导栅结构比开槽前的相速更低，用作行波管的慢波结构时，可降低工作电压，工艺上容易实现，而且耦合阻抗均在45Ω以上，满足毫米波行波管的要求；在内开槽宽度一定的前提下，槽深、栅间距和栅周期的增大对降低系统相速有利。
英文摘要：
The software MWS （microwave studio） which is provided by the CST company in German was introduced to simulate and calculate dispersion relation and coupling impedance. The high frequency characteristics of the inner slotted rectangular waveguide grating was simulated. The results indicate that the slotted rectangular waveguide grating has lower phase-velocity than the un-slotted one. When it is used as the slow-wave structure of the traveling wave tube, the operating voltage decreases, and the coupling impedance also decreases but it lies above 45 Ω, which satisfies the need of millimeter wave traveling wave tube （TWT）. Meanwhile, keeping the inner slotted width constant, it is very useful to increase the groove-depth, grating-spacmg and gratingperiod for improving the phase velocity of system. The present analysis will be helpful to further study and design of this kind RF system used in millimeter wave TWT.
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