基于电磁超材料的射频能量收集器设计及性能验证  

Design and performance verification of RF energy harvester based on electromagnetic metamaterial

作　　者：尉易庆 杨慧敏 WEI Yiqing;YANG Huimin(Department of Electronics,Xinzhou Normal University,Xinzhou 034000,China)

机构地区：[1]忻州师范学院电子系,山西忻州034000

出　　处：《传感器与微系统》2024年第1期91-94,98,共5页Transducer and Microsystem Technologies

基　　金：山西省高等学校科技创新计划资助项目(2023L293)。

摘　　要：设计了一种用于2.45GHz射频(RF)能量收集的超材料能量收集器,为典型的三明治结构,超材料谐振结构为互补开口谐振环(CSRR),介质层选用具有低损耗角正切特性的F4B材质。通过在CSRR的开口处打孔并加载负载电阻,实现了WiFi频段电磁(EM)能量的完美吸收。通过对收集器输入阻抗及多物理场分布的仿真,从不同方面分析了超材料能量收集器的吸波机理。样品的测试结果表明:所设计的超材料能量收集器能够在2.5 GHz达到89.3%的能量收集效率。验证了所设计的超材料谐振结构用于WiFi能量收集的可行性,可用于低功耗消费电子、医疗植入设备、物联网传感器节点等的主要或供电辅助来源。A metamaterial energy harvester for 2.45 GHz radio frequency(RF)energy harvesting is designed.It consists of a typical sandwich structure with a resonant structure of complementary split resonant ring(CSRR)and the middle dielectric layer is made up of F4B material with low loss angle tangent performance.The perfect absorption of electromagnetic(EM)energy in the WiFi band is achieved by punching holes at the split of the CSRR and loading the load resistor.Then,the absorption mechanism of the metamaterial energy harvester is analyzed from different aspects by simulating the input impedance and multiphysics field distribution.The measurement results of the prototype show that the designed metamaterial energy harvester is able to achieve an energy harvesting efficiency of 89.3%at 2.5GHz.It validates the feasibility of the designed metamaterial resonant structure for energy harvesting in the WiFi band,which can be used as a primary or power-assisted source for low-power consumer electronics,medical implantable devices,IoT sensor nodes,and so on.

关 键 词：超材料 能量收集 欧姆损耗 电磁谐振 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TB34[自动化与计算机技术—控制科学与工程]