【作者】 陈娜； 胡三明； 窦文斌；

【Author】 Chen Na;Hu Sanming;Dou Wenbin;State Key Laboratory of Millimeter Waves,School of Information Science and Engineering,Southeast University;

【机构】 东南大学毫米波国家重点实验室信息科学与工程学院；

【摘要】 本文提出了一种用于无线感知液体的射频识别(RFID)标签。与传统有源标签相比,该类无芯RFID标签,既无需芯片,又无需电池,具备无线感知、使用寿命长、加工简单、成本骤减等突出优点。本文所提出的无芯标签,在四分之一模基片集成波导(QMSIW)谐振腔表面加载金属缝隙,并在高电场强度区域设置空孔,用于加载液体样品。不同的液体样品具有相应的介电常数,因此将使加载液体后的标签谐振频率产生偏移。该频率偏移与后向散射参数一一对应,进而可用于反推待测样品的介电常数,从而区分几种特定液体。通过实测两种液体材料,本文实验验证了该紧凑型无芯标签的有效性和可靠性。与现有同类标签相比,该标签可贴附于包含金属在内的物体表面;通过搭建圆极化收发系统,提高了应用中标签摆放方向的灵活性;此外,该标签具有所需液体样品量少等优点。更多还原

【Abstract】 This paper presents a radio frequency identification(RFID) tag for wireless sensing of liquids.Compared with traditional active tags,this type of chipless RFID tag requires no chips or batteries,and has outstanding advantages such as wireless sensing,long life time,simple processing,and significant reduction of cost.The chipless tag proposed in this paper loads slots on the surface of a quarter-mode integrated substrate(QMSIW) resonator and provides holes in the high electric field strength region for loading liquid samples.Different liquid samples have corresponding dielectric constants and will therefore shift the resonant frequency of the tag after loading the liquid.The frequency offset corresponds to the backscattering parameter,and thus can be used to reverse the dielectric constant of the sample under test and distinguish a specific liquid.The measurement of two liquid materials verified the effectiveness and reliability of the compact tag.Compared with existing similar tags,the tag can be attached to the surface of objects including metal,moreover,the tag with arbitrary rotation can still be identificated by a circular polarization transceiver,last but not least,the tag has the advantage of requiring only a small amount of liquid sample.更多还原