一种通用型UHF RFID读写器天线的设计  

Design of a Universal UHF RFID Reader Antenna

作　　者：杨文贵 李兴广[1] 张良 陈恩志 YANG Wen-gui;LI Xing-guang;ZHANG Liang;CHEN En-zhi(School of Electronics and Information Engineering,Changchun University of Science and Technology,Changchun 130022)

机构地区：[1]长春理工大学电子信息工程学院,长春130022

出　　处：《长春理工大学学报（自然科学版）》2021年第5期79-85,共7页Journal of Changchun University of Science and Technology(Natural Science Edition)

基　　金：吉林省科技发展计划(20150204033GX)。

摘　　要：针对全球各国超高频(ultra high frequency,UHF)射频识别技术(radio frequency identification,RFID)系统许可频段不同问题以及圆极化特性天线需求,提出了一种覆盖全球UHF频段(840~960 MHz)的通用型RFID读写器天线。该天线以传统微带单极子天线为理论基础,采用一个V形边沿接地板和一个微带线偏心馈电的非对称多边形辐射贴片,实现了天线的圆极化和宽带化特性。天线尺寸大小为90 mm×100 mm×0.8 mm。使用HFSS软件对天线进行了建模、仿真和优化设计,并对天线实物进行了测试,测试结果跟仿真结果有着良好的一致性。最后得到的天线阻抗带宽为154 MHz,相对阻抗带宽为17.2%;轴比带宽为211 MHz,相对轴比带宽为22.8%;+Z方向上的最大增益为2.1 dBi;在+Z和-Z方向上分别辐射右旋圆极化波和左旋圆极化波。该天线具有宽带且小型化的良好特性,能满足全球通用型UHF RFID读写器天线的应用要求。Aiming at the different problems of the licensed frequency bands in the system of ultra-high frequency(UHF)RFID in the world and the requirements of the circularly polarized antenna,a universal RFID reader and writer antenna covering the global UHF frequency band(840~960 Mhz)is proposed.a universal RFID reader antenna covering the global UHF band(840~960 MHz)is proposed.Based on the traditional microstrip monopole antenna,the antenna adopts a V-shaped edge grounding plate and a microstrip line eccentrically fed asymmetric polygonal radiation patch to realize the circular polarization and broadband characteristics of the antenna.The antenna size is 90 mm×100 mm×0.8 mm.The antenna was modeled,simulated and optimized using HFSS software,and the antenna was tested.The test results were in good agreement with the simulation results.The resulting antenna impedance bandwidth is 154 MHz,the relative impedance bandwidth is 17.2%;the axial ratio bandwidth is 211 MHz,the relative axial ratio bandwidth is 22.8%;the maximum gain in the+Z direction is 2.1 dBi;it radiates right-handed circularly polarized waves and left-handed circularly polarized waves in the+Z and-Z directions,respectively.The antenna has good characteristics of broadband and miniaturization,and can meet the application requirements of universal UHF RFID reader antenna.

关 键 词：UHF RFID读写器天线 微带单极子天线 圆极化 宽带化 

分 类 号：TN129[电子电信—物理电子学]