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On-line Access: 2024-11-05

Received: 2024-05-10

Revision Accepted: 2024-09-30

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Frontiers of Information Technology & Electronic Engineering 

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2-bit dual-polarized reconfigurable intelligent metasurface with low power consumption for 6G near-field communication


Author(s):  Xiaowei CAO, Changjiang DENG, Youjia YIN, Yinan HAO, Weidong HU, Zhewei FU, Zhiji DENG

Affiliation(s):  School of Integrated Circuits and Electronics, Beijing Institute of Technology, Beijing 100081, China; more

Corresponding email(s):  dengcj11@bit.edu.cn

Key Words:  Reconfigurable intelligent surface (RIS); Dual polarization; Near-field communication; 6G communication


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Xiaowei CAO, Changjiang DENG, Youjia YIN, Yinan HAO, Weidong HU,Zhewei FU, Zhiji DENG. 2-bit dual-polarized reconfigurable intelligent metasurface with low power consumption for 6G near-field communication[J]. Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/FITEE.2400379

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Abstract: 
Near-field communication using large-scale antenna arrays is one of the hot research topics in 6G communication. Reconfigurable intelligent surface (RIS) is a cost-effective method for manipulating electromagnetic waves in the near field. This article proposes a 2-bit dual-polarized RIS that has the merits of being low cost and having low power consumption, high phase accuracy, and polarization diversity. Each element consists of an aperture-coupled microstrip patch, two SP4T switches, and two groups of microstrip delay lines. 2-bit phase shift is achieved by using only one SP4T switch that controls the connection of four parallel delay branches. Dual polarization is generated by placing two orthogonal slots with two 2-bit phase shifters. A 15×15 RIS prototype operating in the 3.6 GHz band is fabricated and measured. The beam can be scanned in the ±60° range, with peak aperture efficiency of 40.1% for vertical polarization and 38.3% for horizontal polarization. What is more, the total power consumption of the RIS is merely about 100 mW, which is very attractive for massive deployment in 6G near-field communication.

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