Analysis for transmission characteristics of closed trapezoidal-groove waveguide with boundary element method

In this paper, the cut-off and dispersion characteristics of a new kind of closed trapezoidal-groove waveguide that has more advantages than open groo ve waveguides are analyzed with the help of the boundary element method the relationship between cut-off wavelengths and variations of guide's relativ e sizes is discussed in detail The calculated results are in good agreement with those in the relevant reference. So the obtained conclusions are very important in theoretical studies and actual applications of closed trapezo idal-groove waveguides for millimeter and submillimeter waves.