In this study, a metamaterial comprising an N-type strip (NS) and a double split-ring resonator (DSRR) has been investigated, which is the first to exhibit the broadband electromagnetically induced transparency (EIT) effect and dual-band transmission-type polarization conversion under microwaves. The transmittance coefficient reaches a maximum value of 0.94 at 13.10 GHz, while the bandwidth of the transparency window is 4.96 GHz. At 9.48 GHz and 14.36 GHz, almost all the transmitted co-polarization waves are converted into cross-polarization waves at the polarization conversion ratios of 95% and 94%, respectively. The surface current distributions have been used to analyze the phenomena of EIT and transmission-type polarization conversion. The group delay value (15.35 ps) is calculated to exhibit the slow light effect at the transparency peak. It is expected that the proposed metamaterial will be beneficial for manufacturing slow-light devices and for communication applications.

在这项研究中，研究了一种由N型带（NS）和双裂环谐振器（DSRR）组成的超材料，这是第一个展示宽带电磁感应透明（EIT）效果和双频传输的材料，微波下的极化转换类型。透射系数在13.10 GHz时达到0.94的最大值，而透明窗的带宽为4.96 GHz。在9.48 GHz和14.36 GHz时，几乎所有传输的同极化波都分别以95％和94％的极化转换率转换为交叉极化波。表面电流分布已用于分析EIT和透射型极化转换现象。计算出群延迟值（15.35 ps）以在透明峰处显示慢光效果。