And the bandwidth when the waveguide operates in single mode is determined by the cutoff frequency of the E_ ( y) 1 mode and that of the E_ ( y) 2 mode. 波导单模工作的带宽由E(y)1和E(y)2模式的低端截止频率决定。
Finite element method ( FEM) is introduced to analyze and compute the eigenvalues of double ridged waveguide, single ridged waveguide and unsymmetry ridged waveguide. Eigenvalue solutions of three ridged waveguides are solved and the useful curves on cutoff frequency and bandwith are provided. 本文将有限元法引入到双脊、单脊和不对称脊波导特征值的分析中,求解出了三种脊波导的特征值,并给出了截止频率和主模带宽曲线。
In order to solve the problem of cutoff frequency of rectangular ridged waveguide, effects of trains on cutoff frequency in rectangular tunnel are analyzed by using ridged waveguides method. 为求解矩形正脊波导的截止频率问题,把求解矿井隧道中存在列车时的电磁波传播特性问题归结为求解矩形正脊波导截止频率的问题。