中文摘要：

基于理论分析，实验研究了二维磁单负材料／双正材料/磁单负材料表面等离子波导的滤波效应．研究表明，该波导结构具有低通滤波性质，引入分支缺陷之后，由于谐振效应该波导具有带阻滤波效应．分支缺陷相当于亚波长谐振腔，谐振腔的长度决定带阻滤波器的中心频率，而中心频率几乎不受缺陷位置的影响；滤波器透射率下降的幅度由耦合距离决定．通过引入谐振腔及改变谐振腔的长度、数量以及耦合间距等参数，可以实现可调节的表面等离子波导滤波器．实验结果与理论分析符合得很好，该性质将在可调的单通道或多通道带阻滤波器件中具有潜在的应用价值．

英文摘要：

Based on theoretical analysis, in this paper studied are the low pass and band stop filter effects of the u-negative materials/double positive materials//.t-negative materials （MNG-DPS-MNG） surface plasmon polaritons waveguide with branch defect. The research results show that the defect is equivalent to a sub wavelength resonator. The central frequency of the band stop filter is determined by the resonator length and it is independent of the position where the resonator is located in the MNG region. The transmission dips of the waveguide are closely related to the coupling distance. So the filter characteristics of the surface plasmon polariton waveguide can be adjusted by changing the resonator length and number and the coupling distance. The experimental results are in good agreement with simulation results. These properties will have potential application value in the tunable single channel or multi-channel band stop filters.