Polarization-insensitive dual-band bidirectional analogous electromagnetically induced transparency metamaterials

Abstract In this paper, a three-layer metamaterial is designed in the microwave band. The transmission of the metamaterial is analyzed by the finite-integration time-domain method, and the dual-band analogous electromagnetically induced transparency (EIT) effect is obtained. Due to the rotational symmetry of the top and bottom layers of the structure, it is orthogonal polarization insensitive and has a bidirectional EIT effect. The physical mechanism of the dual-band EIT generated by the structure is further analyzed using the electric field distribution and multilevel scattering theory. The group delay and group exponent of the structure were calculated. The results show that the group exponent of the structure can reach 1000, so the structure has potential applications in microwave communication and multi-frequency filtering.