基于古铜钱结构的高增益超材料UHF-RFID天线

A UHF-RFID Antenna of High Gain With The Metamaterial Structure of Chinese Ancient Coins

基于电超材料的双回路镜像对称设计原理,本文设计了一款基于中国古代铜钱形状的超材料结构。仿真数据表明,该结构超材料具有零折射率的特性,对电磁波具有汇集作用。进一步,将该超材料结构单元排列成3×5阵列并加载到超高频(UHF)频段的射频识别(RFID)阅读器天线上,给出了天线的S11、方向性图以及增益的参数扫描曲线。天线仿真增益从10.6d Bi增大到12.5d Bi,证明了这种设计方案的可行性。

Double-loop mirror symmetric principle is based on electric metamaterials. We design a metamaterial structure of ancient Chinese coins with this principle. Simulation shows that the metamaterial has the characteristics of zero refractive index and can focus the electromagnetic wave to one direction. Further, we arrange the unit cells of the metamaterial to a 3×5 array and load the array to the UHF-RFID reader antenna. Then the return loss,directivity pattern and the parameter scanning curve of the gain are given in this paper. The simulation shows that the gain of the antenna with the metamaterial improves from 10.6d Bi to 12.5d Bi which prove the feasibility of the design.