证明了两块表面具有亚波长凹槽结构的金属板平行放置构成的褶皱金属结构平板波导与等离子体辅助平板波导存在相同点和不同点；并且设计了凹槽深度渐变的对称褶皱金属结构平板波导来实现传输模和表面模的相互转换。研究表明，由于在波导中间区域场分布和能量主要集中在褶皱表面，放入其中的理想导体圆柱不影响其场分布和传输特性，即深度渐变的对称褶皱金属结构平板波导具有隐形效应；褶皱金属结构平板波导阻带上边带截止频率随放入褶皱内样品的介电常数呈线性变化，能够用于介质传感；以柴油、液态石蜡和橄榄油等样品的检测为例，证实了其太赫兹传感特性。该工作对研究褶皱金属结构平板波导的应用，探索其在太赫波的传输、调控以及太赫器件研制等方面具有指导意义。

The corrugated metal parallel plate waveguide composed by two parallel plates with subwavelength corrugations on both surfaces shows some similarities and differences with plasmon-assisted parallel plate waveguide are confirmed. A symmetrical corrugated metal parallel plate waveguide with gradually changed depth of corrugations is designed to convert electromagnetic wave between transmission mode and surface mode. Due to the field distribution and the power flow are concentrated on the corrugated surface at the intermediate region of the waveguide, a cylindrical perfect electric conductor put into the center of the waveguide does not affect its field distribution and transmission characteristics, namely the waveguide has stealth effect. The cutoff frequency of the upper sideband of corrugated metal parallel plate waveguide’s band gap changes linearly with the permittivity of sample substance which is filled in the corrugations, and therefore it can be used in dielectric sensing. The terahertz sensing characteristics are confirmed by the detection of samples such as diesel, liquid paraffin and olive oil. This work is helpful for exploring the application of the corrugated metal parallel plate waveguide in terahertz wave transmission, manipulation and terahertz device design.