单负介质薄板波导中的表面波模式

 推导了沿单负介质薄板波导传播表面波的特性，根据本征方程运用图解法得到沿介电常数为负的单负介质薄板传播的奇偶对称TM型表面波的色散曲线图和能流分布图。发现表面波在单负介质波导中传播比在双正或双负介质波导中慢，场和能量集中于介质板的上下表面， 一定频率范围内奇偶表面波型能流反向；单片单负介质板能实现功分器和定向耦合器的功能，简化了传统的复杂结构，在发展微波器件的小型化方面有着潜在的应用价值。

Surface waves on a single negative slab waveguide

The properties of surface waves along the single-negative slab waveguide are analyzed in this paper.According to the eigen equations,the graphical-solution technique is used to get dispersion curves profiles and energy flux distribution profiles of odd and even symmetric TM surface modes which propagate along the epsilon-negative slab.It is found that surface waves propagate along the single-negative slab more slower than that along the double-positive or double-negative slab waveguide;Field and energy are confined on the top and bottom surfaces;Energy fluxes of odd and even symmetric surface waves have opposite directions in a certain frequency range.It is proposed that a power divider and a directional coupler can be constructed by a single single-negative slab.This simplifies the conventional complex structures and may be utilized to design novel compact RF/microwave devices.