Pushing the Physical Limits of IoT Devices with Programmable Metasurfaces
Pushing the Physical Limits of IoT Devices with Programmable Metasurfaces
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2020-07
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通讯作者：
Lili Chen;Wenjun Hu;K. Jamieson;Xiaojiang Chen;Dingyi Fang;Jeremy Gummeson
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作者：
Lili Chen;Wenjun Hu;K. Jamieson;Xiaojiang Chen;Dingyi Fang;Jeremy Gummeson
小型、低成本的物联网设备通常只配备一个低质量的天线，这大大限制了通信范围和链路质量。特别地，这些天线通常是线性极化的，因此容易受到极化失配的影响，这可以容易地在去往和来自这些设备的通信上引起10-15 dBm的链路损耗。在这项工作中，我们强调了这个未被充分认识的问题，并提出了用超材料制成的可编程RF敏感表面来增强物联网部署环境。我们的智能元表面通过旋转穿过或反射离开表面的信号的偏振来减轻偏振失配。我们将我们的元表面集成到物联网网络中，作为LAMA，一种低功耗的致动元表面阵列，专为普遍使用的2.4 GHz ISM频段设计。我们优化了LAMA的元表面设计，以实现低传输损耗和低成本，从而促进大规模部署。然后，我们建立了一个端到端的系统，驱动的元表面结构，以优化链路性能在真实的时间。我们的实验原型为基础的评估表明，在链路功率的增益高达15 dBm，和100和180 Kbit/s/Hz的无线容量的改进，通过表面和表面反射的情况下，分别归因于偏振旋转属性的LAMA的元表面。
Small, low-cost IoT devices are typically equipped with only a single, low-quality antenna, significantly limiting communication range and link quality. In particular, these antennas are typically linearly polarized and therefore susceptible to polarization mismatch, which can easily cause 10-15 dBm of link loss on communication to and from such devices. In this work, we highlight this under-appreciated issue and propose the augmentation of IoT deployment environments with programmable, RF-sensitive surfaces made of metamaterials. Our smart meta-surface mitigates polarization mismatch by rotating the polarization of signals that pass through or reflect off the surface. We integrate our metasurface into an IoT network as LAMA, a Low-power Lattice of Actuated Metasurface Antennas, designed for the pervasively used 2.4 GHz ISM band. We optimize LAMA's metasurface design for both low transmission loss and low cost, to facilitate deployment at scale. We then build an end-to-end system that actuates the metasurface structure to optimize for link performance in real time. Our experimental prototype-based evaluation demonstrates gains in link power of up to 15 dBm, and wireless capacity improvements of 100 and 180 Kbit/s/Hz in through-surface and surface-reflective scenarios, respectively, attributable to the polarization rotation properties of LAMA'S metasurface.