摘要
UHF RFID标签在密集布放环境下,会由于标签天线间的互相影响,使工作频率发生偏移,造成系统漏读。因而本文设计了一款新型的圆极化阅读器天线,该天线工作在UHF频段,具有小型化、高增益、宽频带的特点。其中主辐射圆形贴片通过4个探针与微带匹配网络上下相连,匹配网络的引入提高了天线的圆极化轴比和工作带宽。仿真结果表明,该天线在UHF频段的阻抗带宽和3dB轴比带宽分别为13%和5%,增益高达9.4dBi。在空旷的环境下,对密集布放的多个RFID标签进行读取测试。实验表明,运用宽频带的RFID阅读器天线可以有效地提高标签的读取率。
When Ultra High Frequency Radio Frequency Identification （UHF RFID） tags in dense cloth environment, the work frequency of stacked RFID tags will be deviated by the mutual influence between the tag antennas, and the system read rate will he declined. This paper designed a new type of circular polarization reader antenna, which works in the UHF frequency band, has the characteristics of miniaturization, high gain, and wide band. In this antenna, the main radiation circular patch is connected up and down by four probes to the matching network, which can effectively improve the circular polarization axial ratio bandwidth and work bandwidth of antenna. The simulation results show the antenna has 13% bandwidth of impedance and 50% bandwidth of 3 dB axial ratio, and 9. 4 dBi gain in the UHF frequency. In the open environment, we test the tag read rate of intensive multiple RFID tags. The experimental results show that the wide band RFID reader antenna is available.
出处
《电子测量技术》
2015年第5期19-23,共5页
Electronic Measurement Technology
基金
上海市科学技术委员会重点支撑(12510500600)项目
关键词
圆极化
宽频带
馈电网络
circular polarization
wide band
matching network
