A filtering reconfigurable intelligent surface for interference-free wireless communications

Jing Cheng Liang, Lei Zhang, Zhangjie Luo (), Rui Zhe Jiang, Zhang Wen Cheng, Si Ran Wang, Meng Ke Sun, Shi Jin, Qiang Cheng () and Tie Jun Cui ()
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Jing Cheng Liang: Southeast University
Lei Zhang: Southeast University
Zhangjie Luo: Southeast University
Rui Zhe Jiang: Southeast University
Zhang Wen Cheng: Southeast University
Si Ran Wang: Southeast University
Meng Ke Sun: Southeast University
Shi Jin: Southeast University
Qiang Cheng: Southeast University
Tie Jun Cui: Southeast University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract The powerful capability of reconfigurable intelligent surfaces (RISs) in tailoring electromagnetic waves and fields has put them under the spotlight in wireless communications. However, the current designs are criticized due to their poor frequency selectivity, which hinders their applications in real-world scenarios where the spectrum is becoming increasingly congested. Here we propose a filtering RIS to feature sharp frequency-selecting and 2-bit phase-shifting properties. It permits the signals in a narrow bandwidth to transmit but rejects the out-of-band ones; meanwhile, the phase of the transmitted signals can be digitally controlled, enabling flexible manipulations of signal propagations. A prototype is designed, fabricated, and measured, and its high quality factor and phase-shifting characteristics are validated by scattering parameters and beam-steering phenomena. Further, we conduct a wireless communication experiment to illustrate the intriguing functions of the RIS. The filtering behavior enables the RIS to perform wireless signal manipulations with anti-interference ability, thus showing big potential to advance the development of next-generation wireless communications.

Date: 2024
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DOI: 10.1038/s41467-024-47865-6

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