A dual-band asymmetric transmission device based on the nonlinear electromagnetically induced transparency (EIT) effect is presented in this paper. The device structure is composed of two P-type branches and two split ring resonators (SRRs). Dual-band EIT effect is induced based on the destructive interferences between scattering fields of the SRRs and branches in a microstrip transmission line system. Moreover, nonlinear varactor diodes and the asymmetric absorption resistor are added to EIT structure based on microstrip line couplings, which results in the asymmetric transmission property. The 10 dB and 7.5 dB transmission light contrasts at the frequencies of 0.85 GHz and 0.95 GHz with the input power of − 3 dBm are demonstrated experimentally. Such low-loss, broadband and high-contrast asymmetric transmission device results from the EIT mechanism, which possesses narrower, sharper and higher transmittance features. Such results will be very beneficial for new nonlinear electromagnetic devices.

中文翻译：

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基于电磁感应透明（EIT）效应的微带传输线双频非对称传输

本文提出了一种基于非线性电磁感应透明（EIT）效应的双频非对称传输装置。该器件结构由两个 P 型支路和两个裂环谐振器 (SRR) 组成。双频 EIT 效应是基于微带传输线系统中 SRR 和分支的散射场之间的相消干涉引起的。此外，在基于微带线耦合的EIT结构中加入非线性变容二极管和非对称吸收电阻，导致非对称传输特性。实验证明了 0.85 GHz 和 0.95 GHz 频率下 10 dB 和 7.5 dB 传输光对比，输入功率为 − 3 dBm。这么低的损耗，宽带和高对比度非对称传输装置源于 EIT 机制，其具有更窄、更锐利和更高的透射率特征。这样的结果对于新的非线性电磁装置将非常有益。