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Open AccessArticle

An Optically Transparent Metasurface-Based Resonant Cavity Fed by Patch Antenna for Improved Gain

by Qinlong Li 1, Xiaoming Chen 1,* and Xin Hu 2,*
1
School of Information and Communications Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(23), 3805; https://doi.org/10.3390/ma12233805
Received: 21 September 2019 / Revised: 13 November 2019 / Accepted: 19 November 2019 / Published: 20 November 2019
(This article belongs to the Section Materials Simulation and Design)
An optically transparent metasurface (MS) is proposed to design a resonant cavity fed by a patch antenna operating at 5.6 GHz. In the proposed MS, a transparent micro metal mesh conductive (MMMC) film is used as the transparent conducting film (TCF), and it has a high optical transmittance of more than 75% and a low sheet resistance of 0.7 Ω/sq. The MS is composed of a layer of glass substrate and a layer of MMMC film. The unit cell of MS consists of a square patch using MMMC film patterned on a square glass substrate. The transparent MS, patch antenna, ground plane, and air-filled half-wavelength cavity form a resonant cavity antenna, to achieve an improved gain. The MS is designed, optimized and analyzed using the EM simulation software CST. Results show that the MS can improve the simulated boresight gain from 4.7 to 13.2 dBi by 8.5 dB, without affecting the impedance bandwidth (IMBW) much. The losses of MS with different values of sheet resistance are also studied, showing the MS using MMMC with sheet resistance of 0.7 Ω/sq has very small losses. View Full-Text
Keywords: metasurface; transparent conductive film; patch antenna; gain improvement metasurface; transparent conductive film; patch antenna; gain improvement
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MDPI and ACS Style

Li, Q.; Chen, X.; Hu, X. An Optically Transparent Metasurface-Based Resonant Cavity Fed by Patch Antenna for Improved Gain. Materials 2019, 12, 3805.

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