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.
作者
李爱莲
华昌洲
LI Ailian;HUA Changzhou(Faculty of Electrical Engineering and Computer Science,Ningbo University,Ningbo 315211,China)
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)。
