一种热带鱼形端射圆极化RFID阅读器天线  

An Tropical Fish Shaped End-Fire Circularly Polarized RFID Reader Antenna

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》2024年第1期21-25,共5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：本文提出了一种端射圆极化RFID阅读器天线。该天线采用矩形波导结构(等效为磁偶极子)结合一对热带鱼形振子结构(等效为电偶极子),同时采用约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处的S11为-29.5 dB,增益Gain为4.49 dBi,阻抗带宽为90 MHz(880 MHz-970 MHz),3 dB轴比带宽(AR)为150 MHz(850 MHz-1000 MHz),可广泛应用于超高频RFID阅读器。In this paper,an end-fire circularly polarized antenna for RFID readers is proposed.The antenna is combined by a rectangular waveguide structure(equivalent to a magnetic dipole)and a pair of tropical fish shaped dipole structure(equivalent to an electric dipole).At the same time,a quarter-wavelength microstrip line structure and U-shaped 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 resonance frequency point is-29.5 dB,the gain is 4.49 dBi,and the impedance bandwidth is 90 MHz(880 MHz-970 MHz).and the 3 dB axial-ratio(AR)bandwidth is 150MHz(850MHz-1000MHz),which can be widely used in UHF RFID readers.

关 键 词：RFID阅读器 高增益 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]