UniScatter: a Metamaterial Backscatter Tag for Wideband Joint Communication and Radar Sensing
UniScatter: a Metamaterial Backscatter Tag for Wideband Joint Communication and Radar Sensing
复制标题
DOI：
10.1145/3570361.3592526
复制
发表时间：
2023-07
期刊：
影响因子：
--
通讯作者：
Kun Qian;Lulu Yao;Kai Zheng;Xinyu Zhang;T. Ng
中科院分区：
文献类型：
--
作者：
Kun Qian;Lulu Yao;Kai Zheng;Xinyu Zhang;T. Ng
毫米波反向散射能够同时支持高精度传感和大规模通信，是下一代无线系统中一项突出的技术演进。理想情况下，反向散射标签应能在较宽的毫米波频谱范围内工作，具有一致的信号强度和角度覆盖范围，以适应高度多样化的应用场景。然而，现有的由谐振天线和射频集成电路制成的标签仅能实现几吉赫兹的带宽，很难满足这些要求。在本文中，我们提出了UniScatter，一种基于超材料的新型反向散射标签结构。UniScatter的关键设计是一个基于石墨烯的调制器和一个基于透镜的后向反射器，它们在较宽的频率范围和大角度视场内具有一致的电磁响应。我们为UniScatter开发了一种可靠的制造工艺，并在各种毫米波传感和通信设备上对其进行了测试。我们的现场测试表明，UniScatter能够在24吉赫兹到77吉赫兹的宽频带上反向散射信号，在三维空间中具有始终较高的信号强度和宽角度覆盖范围。
Millimeter-wave backscatter can simultaneously support high-precision sensing and massive communication and represent one prominent technical evolution in next-generation wireless systems. The backscatter tags should ideally work across a wide mmWave spectrum range with consistent signal strength and angular coverage to accommodate highly diverse application scenarios. However, existing tags made of resonant antennas and RFICs only achieve a few GHz of bandwidth and hardly meet these requirements. In this paper, we present UniScatter, a new backscatter tag structure based on metamaterials. The key design of UniScatter is a graphene-based modulator and a lens-based retroreflector, which have consistent electromagnetic responses across an extensive frequency range and wide angular field-of-view. We have developed a robust fabrication process for UniScatter, and tested it on various mmWave sensing and communication devices. Our field tests show that UniScatter can backscatter signals across a wide frequency band from 24 GHz to 77 GHz with consistently high signal strength and wide angular coverage in 3D space.