Abstract
A tunable polarization-insensitive absorber based on an active frequency-selective surface is proposed for electromagnetic (EM) wave absorption in the L and S bands. The frequency-selective surface consists of a diamond-shaped loop that is interconnected by varactor diodes. The proposed design is significant because of its inclusion of wideband tuning and its ability to easily change from single-band tunable absorption to dual-band absorption. The simulation results demonstrate that the absorption response (> 80%) can vary from 1.62 GHz to 3.66 GHz under the reverse bias voltage, thus creating a tunable range of 125.9%. The absorption region (> 90%) spans from 1.86 GHz to 3.31 GHz and generates a 78% tunable range. The single-band tunable absorber is characterised by an equivalent circuit model to obtain the circuit parameters and predict the absorption frequency. Furthermore, a dual-band absorbing structure is obtained by adding a metasurface directly to the single-layer structure, which can easily be changed from single-band absorption to dual-band absorption by separately controlling the bias voltages of the upper and lower unit cells. The two fabricated prototypes were measured using free-space technology, and the experimental results closely mirror the simulation results. Results show that the proposed structure achieves the dynamic control of EM wave absorption.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 11572248), Department of Science and Technology of Sichuan Province (No. 19ZDYF0024) and Open Project of Key Laboratory of Testing Technology for Manufacturing Process, (Southwest University of Science and Technology), Ministry of Education (No. 18kfzk03).
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Yang, X., Chen, H., Luo, J. et al. Design of a Tunable Polarization-Insensitive Absorber for L and S Bands Using Active Frequency-Selective Surface. J. Electron. Mater. 49, 1173–1183 (2020). https://doi.org/10.1007/s11664-019-07807-1
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DOI: https://doi.org/10.1007/s11664-019-07807-1