Dual-band asymmetric transmission based on electromagnetically induced transparency (EIT) effect in a microstrip transmi
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Dual‑band asymmetric transmission based on electromagnetically induced transparency (EIT) effect in a microstrip transmission line Lei Zhu1 · Tai Cheng Li1 · Zhi Dong Zhang2 · Jing Guo2 · Liang Dong1,3 · De Qing Zhang4 Received: 14 December 2019 / Accepted: 23 March 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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. Keywords Dual-band · Electromagnetically induced transparency (EIT) · Asymmetric transmission
1 Introduction An asymmetric transmission device is a kind of nonreciprocal device that can provide unidirectional transmission in the demanded frequency. In the modern world, lots of systems require asymmetric transmission to work properly, such as isolators, circulators and microwave communication [1]. The asymmetric transmission device has traditionally been designed by using time-reversal symmetry breaking or spatial inversion symmetry breaking [2]. In recent times, as physical implementations of above theories, the ramped * Lei Zhu [email protected] Liang Dong [email protected] 1
Communication and Electronics Engineering Institute, Qiqihar University, Qiqihar 161006, China
2
Science and Technology on Electronic Test & Measurement Laboratory, Ministry of Education, North University of China, Taiyuan 030051, China
3
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
4
School of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, China
index photonic crystals [3], the quasiperiodic photonic lattices [4] and the photonic crystal heterojunction structures [5] are usually utilized to realize the goal of the asymmetric transmission. However, the large volume and low transmission efficiency in these traditional structures limit their wide applications [6]. Compared to the above-mentioned traditional approaches, the transmission spectrum based on electromagnetically induced transparency (EIT) effect [7–13] concurrently owns pointed peaks and dips near the resonance frequency. Hence, the peak can tu
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