Journal
SCIENCE CHINA-INFORMATION SCIENCES
Volume 64, Issue 8, Pages -Publisher
SCIENCE PRESS
DOI: 10.1007/s11432-020-3085-6
Keywords
cutoff frequency; capacitive metasurface; evanescent wave; miniaturized components; rectangular waveguide
Funding
- National Natural Science Foundation of China [62001065, 61871467, 61922018]
- Chongqing Natural Science Foundation [cstc2019jcyjjqX0004]
- Open Project of Zhejiang Provincial Key Laboratory of Advanced Microelectronic Intelligent Systems and Applications
- Fundamental Research Funds for the Central Universities [2020CDJGFWDZ013]
- Open Fund Project of Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing [GXKL06190207]
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This work proposes an approach to efficiently couple evanescent waves below the cutoff frequency using ultrathin planar capacitive metasurfaces, demonstrating potential applications in miniaturized and high-performance transmission components.
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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