一种UHF RFID阅读器终端可调谐圆极化天线研究
Analysis on Tunable Circularly Polarized Antenna for Applications of UHF RFID Reader Devices
作者: 吴凯敏 , 赵雪峰 , 黄勇军 , 孙海斌 , 文光俊 :电子科技大学通信与信息工程学院射频集成电路与系统研究中心,四川 成都;
关键词: 圆极化天线; UHF RFID; 铁氧体; 可调谐; Circularly Polarized Antenna; UHF RFID; Ferrite; Tunable
摘要:Abstract: A tunable circularly polarized (CP) patch antenna based on ferrite substrate is discussed in this paper, for universal ultra-high-frequency (UHF) RF identification (RFID) applications. Such antenna is composed of top dielectric layer printed with rectangular radiation patch, middle ferrite layer, and bottom dielectric layer printed with ground plane. The ferrite layer under an applied dc magnetic bias provides the CP radiation characteristic. Most importantly, ferrite layer can tune arbitrarily the operating frequency band in a wide range covering all the worldwide operating frequency bands of UHF RFID, by adjusting the dc magnetic bias. Theoretical analysis on the reason to realize CP properties without perturbation for the radiation patch and the tunability of operating frequency are firstly presented. Numerical results demonstrate that the proposed antenna, can be arbitrarily operated from 840 to 960 MHz with a narrow impedance bandwidth of about 7 MHz, a tunable gain level ranged from −1.9 to 2.5 dBic, and a wide 3-dB AR beamwidth of 120˚ over the impedance bandwidth.
文章引用: 吴凯敏 , 赵雪峰 , 黄勇军 , 孙海斌 , 文光俊 (2015) 一种UHF RFID阅读器终端可调谐圆极化天线研究。 天线学报, 4, 1-8. doi: 10.12677/JA.2015.41001
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