Chen Ming Zheng, Tang Wankai, Dai Jun Yan, Ke Jun Chen, Zhang Lei, Zhang Cheng, Yang Jin, Li Lianlin, Cheng Qiang, Jin Shi, Cui Tie Jun
Institute of Electromagnetic Space, Southeast University, Nanjing 210096, China.
National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China.
Natl Sci Rev. 2021 Jul 29;9(1):nwab134. doi: 10.1093/nsr/nwab134. eCollection 2022 Jan.
We propose a theoretical mechanism and new coding strategy to realize extremely accurate manipulations of nonlinear electromagnetic harmonics in ultrawide frequency band based on a time-domain digital coding metasurface (TDCM). Using the proposed mechanism and coding strategy, we design and fabricate a millimeter-wave (mmWave) TDCM, which is composed of reprogrammable meta-atoms embedded with positive-intrinsic-negative diodes. By controlling the duty ratios and time delays of the digital coding sequences loaded on a TDCM, experimental results show that both amplitudes and phases of different harmonics can be engineered at will simultaneously and precisely in broad frequency band from 22 to 33 GHz, even when the coding states are imperfect, which is in good agreement with theoretical calculations. Based on the fabricated high-performance TDCM, we further propose and experimentally realize a large-capacity mmWave wireless communication system, where 256 quadrature amplitude modulation, along with other schemes, is demonstrated. The new wireless communication system has a much simpler architecture than the currently used mmWave wireless systems, and hence can significantly reduce the hardware cost. We believe that the proposed method and system architecture can find vast application in future mmWave and terahertz-wave wireless communication and radar systems.
我们提出了一种理论机制和新的编码策略，以基于时域数字编码超表面（TDCM）在超宽频带内实现对非线性电磁谐波的极其精确的操控。利用所提出的机制和编码策略，我们设计并制造了一种毫米波（mmWave）TDCM，它由嵌入正-本征-负二极管的可重新编程的超原子组成。通过控制加载在TDCM上的数字编码序列的占空比和时间延迟，实验结果表明，即使编码状态不完美，在22至33 GHz的宽频带内，不同谐波的幅度和相位都可以同时且精确地随意调控，这与理论计算结果高度吻合。基于所制造的高性能TDCM，我们进一步提出并通过实验实现了一种大容量毫米波无线通信系统，其中展示了256正交幅度调制以及其他方案。这种新型无线通信系统的架构比当前使用的毫米波无线系统要简单得多，因此可以显著降低硬件成本。我们相信，所提出的方法和系统架构能够在未来的毫米波和太赫兹波无线通信及雷达系统中找到广泛的应用。
