We demonstrated a novel metamaterial with dual-band electromagnetically induced transparency (EIT) via simulation, experiment and numerical analysis, with resonance frequencies of the transparency peaks of 7.60 and 10.27 GHz. The E-ε metamaterial unit cells were composed of E-shaped and ε-shaped patterns. By analyzing the surface current distribution and the magnetic field, we qualitatively verified the toroidal dipole response in the E-ε metamaterial at 10.27 GHz. Meanwhile, by calculating the multipole’s radiated power, we found that the two transparency peaks were due to the excitation of the electric and toroidal dipole responses. By changing the incident angle from 0° to 60°, we observed changes in transmission spectra, and the quality factors (Q-factors) of the two transparency peaks increased. In addition, the proposed E-ε metamaterial can be designed to act as a refractive index sensor or other electronic equipment for the control of electromagnetic waves.

中文翻译：

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环形双极响应激发的新型双带超材料中的电磁感应透明性

我们通过模拟，实验和数值分析，展示了一种具有双频电磁感应透明性（EIT）的新型超材料，其透明性峰的共振频率为7.60和10.27 GHz。E- ε超材料单元格由E形和ε形图案组成。通过分析表面电流分布和磁场，我们定性地验证了E- ε超材料在10.27 GHz下的环形偶极响应。同时，通过计算多极的辐射功率，我们发现两个透明峰是由于电和环形偶极响应的激发而引起的。通过将入射角从0°更改为60°，我们观察到透射光谱的变化以及质量因数（两个透明度峰值的Q因子都增加了。此外，可以将提出的E- ε超材料设计为充当折射率传感器或其他用于控制电磁波的电子设备。