一种用于超高频RFID阅读器的端射圆极化天线  

An Endfire Circularly Polarized Antenna for UHF RFID Readers

作　　者：李爱莲 华昌洲 LI Ailian;HUA Changzhou(Faculty of Electrical Engineering and Computer Science,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学信息科学与工程学院,宁波315211

出　　处：《无线通信技术》2023年第3期7-12,共6页Wireless Communication Technology

基　　金：国家自然科学基金(62271273);宁波市自然科学基金(2022J097)。

摘　　要：本文提出了一种宽轴比带宽的RFID阅读器端射圆极化天线。该天线结构简单,采用矩形波导结构(等效为磁偶极子)结合一对蝶形振子结构(等效为电偶极子),同时采用四分之一波长的微带线结构和U型微带线调节阻抗匹配以及移相。最终,设计实现了一款超高频端射右旋圆极化天线,仿真结果表明该天线在谐振频点出的S11为-19.6 dB,阻抗带宽为180 MHz(850 MHz-1030 MHz),3 dB轴比带宽(AR)为130 MHz(850 MHz-980 MHz),可广泛应用于超高频RFID阅读器。In this paper,a wide axial-ratio bandwidth end-fire circularly polarized antenna for RFID readers is proposed.The structure of the antenna is simple,which is combined by a rectangular waveguide structure(equivalent to a magnetic dipole)and a pair of butterfly dipole structure(equiva⁃lent to a electric dipole).At the same time,a quarter-wavelength microstrip line structure and Ushaped microstrip line are used to adjust the impedance matching and phase shift.Finally,a UHF end-fire right-handed circularly polarized antenna is designed and realized.The simulation results show that the S11 of the antenna at the resonance frequency point is-19.6 dB,the impedance band⁃width is 180 MHz(850 MHz-1030 MHz),and the 3 dB axial-ratio(AR)bandwidth is 130 MHz(850 MHz-980 MHz),which can be widely used in UHF RFID readers.

关 键 词：RFID阅读器 宽轴比带宽 超高频 端射圆极化天线 

分 类 号：TN82[电子电信—信息与通信工程]