摘要
提出了一种超小型UHF频段无源RFID标签抗金属环境的技术方案。采用高介电常数介质并通过开槽增加电长度,设计中考虑了环境金属物体对标签天线的影响,采用CST MWS软件建立模型并分析了标签天线主要尺寸的变化对标签天线阻抗与所采用的RF芯片阻抗的匹配影响,对造成阻抗变化明显的变量进行调整以获得可接受的阻抗匹配程度。采用网版印刷银浆制作了标签样品并进行实际测试。实验结果表明:实测与仿真结果比较吻合,标签阻抗匹配良好,实测读取距离大于2m满足实际使用需要,标签尺寸仅为12mm×7mm×3mm,可应用于物联网中小型金属物件的管理。
A kind of UHF ultra compact passive RFID tag antenna reducing size by high dielectric constant substrate and extending electric length by slot was presented.Affection due to metal objects was taken into account.Then antenna model was built by CST MWS software impedance matching between tag antenna and RF chip was analyzed with several dimension varied.Then screen printing process was taken to produce a sample tag and compared with the performance to theoretical calculated result.Experiment shows good impedance matching has met and the readable range can reach more than 2m with tag size of 12mm×7mm×3mm.This kind of tag is metal mountable and could be widely applied in compact metal tools management on the Internet of Material Distribution.
出处
《微波学报》
CSCD
北大核心
2012年第2期45-48,70,共5页
Journal of Microwaves
关键词
无源UHF
标签天线
抗金属
超小型
passive UHF
tag antenna
metal mountable
ultra compact
