Hu Mingze, Ren Junyu, Li Yaru, Pang Xiaoyan, Peng Wencan, Zheng Qi
Opt Express. 2025 Jul 28;33(15):32333-32346. doi: 10.1364/OE.569873.
In this article, an ultrathin dual-band metalens is proposed for Internet of Things (IoT) applications in sub-6 GHz and millimeter-wave (mmW) 5G/6G networks. The hybrid metalens, which integrates a Huygens' metasurface and a Fresnel zone plate (FZP) lens, is designed to achieve Huygens' resonance at mmW bands (28 GHz) and partial reflectivity for sub-6 GHz waves (5.8 GHz) with an ultrathin thickness of 1.5 mm. This configuration enables dual-mode operation, where a focused lens is built for high-efficiency mmW beamforming, and a Fresnel zone plate (FZP) lens is formed for sub-6 GHz waves. By incorporating an aperture-shared feed antenna that co-locates a mmW patch radiator and a sub-6 GHz slot resonator within the same compact structure, the design achieves an exceptionally low profile. Experimental results demonstrate high gains of 16.2 dBi at 5.8 GHz and 29.9 dBi at 28 GHz, along with a compact profile of 0.14 (wavelength at 28 GHz) and an ratio of 0.25. The proposed metalens offers a scalable strategy for IoT communications, enabling reliable connectivity and high-speed backhaul for data aggregation and distributed networks in smart cities.
在本文中，提出了一种用于物联网（IoT）应用的超薄双频段超表面透镜，适用于低于6GHz和毫米波（mmW）的5G/6G网络。这种混合超表面透镜集成了惠更斯超表面和菲涅耳波带片（FZP）透镜，设计用于在毫米波频段（28GHz）实现惠更斯共振，并对低于6GHz的波（5.8GHz）实现部分反射率，其超薄厚度为1.5mm。这种配置实现了双模式操作，其中构建了一个聚焦透镜用于高效毫米波波束成形，以及一个用于低于6GHz波的菲涅耳波带片（FZP）透镜。通过在同一紧凑结构中合并一个孔径共享馈电天线，该天线将毫米波贴片辐射器和低于6GHz的缝隙谐振器共定位，该设计实现了极低的外形尺寸。实验结果表明，在5.8GHz时增益高达16.2dBi，在28GHz时增益高达29.9dBi，外形尺寸紧凑，为0.14（28GHz波长），纵横比为0.25。所提出的超表面透镜为物联网通信提供了一种可扩展的策略，能够为智能城市中的数据聚合和分布式网络实现可靠的连接和高速回程。
