无芯片RFID高温传感器设计

Design of chipless RFID high temperature sensor

设计了一种用于高温环境实时监测的基于开口环谐振器(SRR)的无芯片射频识别(RFID)传感器。传感器由双开口圆环谐振结构和氧化铝(Al_(2)O_(3))陶瓷基板构成,尺寸为25 mm×25 mm×0.5 mm。其工作原理是:Al_(2)O_(3)陶瓷基板作为温度敏感材料,具有耐高温的特性,而且介电常数随温度变化而改变,使得整只传感器谐振频率偏移,建立起温度与谐振频率之间的关系,实时监测谐振频率即可获知实时温度。仿真结果表明:设计的温度传感器可以实现200~1000℃监测,对应谐振频率从6.64 GHz下降至6.26 GHz,偏移380 MHz,传感器灵敏度0.475 MHz/℃表现很好,证明了传感器的谐振频率和温度之间存在着准线性关系。设计的无芯片RFID传感器具有无线无源、制作成本低和尺寸小等优点,非常适合应用于高温环境温度检测。

A chipless radio frequency identification(RFID)sensor based on split ring resonator(SRR)is designed for real-time monitoring in high temperature environments.It consists of double circular SRR and alumina ceramic substrate with dimensions of 25 mm×25 mm×0.5 mm.The working principle is that as the temperature sensitive material alumina(Al_(2)O_(3))ceramic substrate has characteristics of high temperature resistant and its permittivity varies with temperature,which results in the shift of resonant frequency of the whole sensor and establishes the relationship between temperature and resonant frequency meaning that real-time monitoring resonant frequency can obtain real-time temperature.Simulation results show that the designed temperature sensor can monitor 200~1000℃corresponding to resonant frequency decreasing 380 MHz from 6.64 GHz to 6.26 GHz with excellent sensitivity of 0.475 MHz/℃,which demonstrates the quasi-linear relationship between resonant frequency and temperature.The presented chipless RFID sensor has the advantages of wireless and passive,low cost and small size et al,which is extremely suitable for high temperature monitoring.