采用传输矩阵法研究了两种色散单负材料组成三明治结构的共振隧穿特性，结果表明如果该结构满足耦合匹配条件时，共振隧穿峰发生吞并。共振峰的隧穿频率不受匹配三层结构厚度比例的影响，厚度的同比例增大，仅仅影响共振透射峰的品质因子。研究了该结构的电场分布特征，结果表明电场分布主要布局域在两种介质的分界面处。但考虑单负材料损耗时，损耗导致该结构电场分布的对称性破坏，透射率降低。

The resonance tunneling characteristic of sandwich structure made of two different single-negative materials is investigated by means of the transfer matrix method. Merging of the resonance tunneling frequency is found when the conjugate matched condition is satisfied. The resonance frequency has nothing to do with the layer thickness when the thickness ratio remains unchanged. The only influence is to cause the resonant peak to be much narrower and quality factor enhanced when layer thickness increases. The electric fields corresponding to frequencies of the resonance modes are found to be strongly localized at interface of two media. When the losses are considered, the losses make the symmetry of electric field distribution destroyed and transmittance depressed.