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Efficient coupling of evanescent waves in rectangular waveguides based on ultrathin planar capacitive metasurfaces

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Abstract

This work proposes an approach to enable efficient coupling of evanescent waves below the cutoff frequency of a standard rectangular waveguide (RWG) system based on ultrathin planar capacitive metasurfaces (CMSs). It is demonstrated that the CMS at the RWG’s cross-section can couple the evanescent wave from one port to the other, and thus enable an efficient frequency-selective transmission below the cutoff frequency. Theoretical formulas, together with the equivalent circuit, are presented to quantitatively illustrate the operational mechanism of the proposed approach. The performance characteristics, including out-of-band suppression, Q-factor, transmission loss, and coupling bandwidth, are studied in a comprehensive manner. Three CMS samples with different surface impedance values are designed, fabricated, and measured. The measurement results show good agreement with the numerical values, validating their highly efficient evanescent wave coupling performance characteristic at selected frequencies below the cutoff frequency, with approximately 100% transmission efficiency. Benefiting from the admirable low-frequency coupling performance, this approach has potential applications in many miniaturized and high-performance transmission components, such as compact evanescent wave resonators, filters, and antennas.

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Acknowledgements

This work was supported in part by National Natural Science Foundation of China (Grant Nos. 62001065, 61871467, 61922018), Chongqing Natural Science Foundation (Grant No. cstc2019jcyjjqX0004), Open Project of Zhejiang Provincial Key Laboratory of Advanced Microelectronic Intelligent Systems and Applications, the Fundamental Research Funds for the Central Universities (Grant No. 2020CDJGFWDZ013), and Open Fund Project of Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing (Grant No. GXKL06190207). The authors would like to thank Prof. R. W. Ziolkowski from the University of Technology Sydney, Australia, for the helpful suggestions.

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Authors and Affiliations

  1. College of Microelectronics and Communication Engineering, Chongqing University, Chongqing, 400044, China

    Da Yi, Ming-Chun Tang & Mei Li

  2. Zhejiang Provincial Key Laboratory of Advanced Microelectronic Intelligent Systems and Applications, Hangzhou, 310027, China

    Da Yi

  3. College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, 310027, China

    Xing-Chang Wei

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  1. Da Yi
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  2. Ming-Chun Tang
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  3. Mei Li
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  4. Xing-Chang Wei
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Correspondence to Ming-Chun Tang.

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Yi, D., Tang, MC., Li, M. et al. Efficient coupling of evanescent waves in rectangular waveguides based on ultrathin planar capacitive metasurfaces. Sci. China Inf. Sci. 64, 182313 (2021). https://doi.org/10.1007/s11432-020-3085-6

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  • DOI: https://doi.org/10.1007/s11432-020-3085-6

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