Finite element analysis of the dominant mode variation in groove guide

In this paper, the dominant mode in groove guide is analysed by finite elem ent method. For the guide with a shallow groove, the electric field lines ( abbreviated as E lines) are perpendicular to the parallel plate, which is d ifferent from the literatures, and the dominant mode distribution is irrele vant to the groove width; for the guide with a narrow but deeper groove, th e E lines are parallel to the plate region, which represents the characteri stics of lower attenuation, for the guide with a deeper and wider groove, a complicated E lines are obtaines. These results reveal that the dominant m ode distribution in groove guide is varied, which replenish our understandi ng of groove guide, and the results have important values in design, manufa cture, and application of groove guide.