The dispersive negative index metamaterial possesses a negative refractive index in the microwave region(1 to 10 GHz), whose effective permittivity and permeability determine different refractive indexes in different frequency regions. The dispersive negative index metamaterial is introduced into one-dimensional photonic crystal to form two structures: positive index media photonic crystal with negative index metamaterial defect, and positive and negative index media photonic crystal with positive index medium defect. By numerical simulation, transmission spectra are shown for the two structures under homogeneous plane electromagnetic wave (TE wave) normal incidence and oblique incidence, in which single- and dual-defect modes appear in different forbidden bands when both effective permittivity and permeability are negative. These defect modes can be used to realize single- and dual-channel filtering, respectively.%在1维光子晶体中引入色散负折射特异介质,分析了其介电常数和磁导率在微波区(1～10GHz)与频率的关系.分别对以色散负折射介质为缺陷的正折射率介质光子晶体及以正折射率介质为缺陷的正负折射率介质光子晶体进行了数值仿真,得出了均匀平面电磁波在正入射和斜入射时的透射谱.结果表明:在介电常数和磁导率均为负值的不同禁带中,分别出现了单、双缺陷模.利用透射谱的这一特点,可实现单、双通道滤波.
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