A Passive RFID Temperature Sensing Antenna With Liquid Crystal Elastomer Switching
A Passive RFID Temperature Sensing Antenna With Liquid Crystal Elastomer Switching
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DOI：
10.1109/access.2020.2969969
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发表时间：
2020-01
期刊：
影响因子：
3.9
通讯作者：
Yousuf Shafiq;J. Henricks;Cedric P. Ambulo;T. Ware;S. Georgakopoulos
中科院分区：
文献类型：
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作者：
Yousuf Shafiq;J. Henricks;Cedric P. Ambulo;T. Ware;S. Georgakopoulos
设计、制造和测试了一种自主和连续运行的射频识别（RFID）温度传感器。该传感器无需电池，可以分别检测多个温度循环（从房间到冷和从冷到房间）的温度阈值交叉点。所提出的传感器通过在902-928 MHz超高频（UHF） RFID频段内控制其工作频率的开关来传递温度阈值交叉。首次使用了具有可逆致动特性的可变形低温反应型液晶弹性体（LCEs）。所提出的传感器设计由带有定制插槽的贴片天线组成。一个无源机械开关连接在这个槽上，并在激活和停用时提供频率切换。采用联合仿真的方法实现了该开关与天线的集成。此外，冷温反应性LCE在温度异常发生时触发开关，从而根据温度变化切换传感器的工作频率。此外，高介电常数衬底和在两个离散频率下工作的单个匹配网络用于设计我们的紧凑型频域温度传感器。此外，基于RFID平台，该传感器在与其他传感器接近的情况下有效地工作。此外，它还通过自主、连续和经济高效的设计提供识别和温度信息。因此，所提出的传感器具有在物联网（iot）应用中运行的潜力，在物联网应用中，从众多传感器中收集大量数据，以提取有价值的信息，从而为互联网虚拟领域的用户、制造商和交付公司带来利益。最后利用ANSYS HFSS和Circuit Designer进行仿真建模。我们的传感器的性能通过测量和模拟验证，非常一致。
An autonomous and continuously operating Radio Frequency Identification (RFID) temperature sensor is designed, manufactured, and tested. This sensor is battery-free and can detect temperature threshold crossings for multiple (room-to-cold and cold-to-room) temperature cycles, respectively. The proposed sensor conveys temperature threshold crossings through the controlled switching of its operating frequency within the 902–928 MHz Ultra High Frequency (UHF) RFID band. For the first time, shape morphing cold-temperature reactive Liquid Crystal Elastomers (LCEs), which provide reversible actuation, are utilized. The proposed sensor design consists of a patch antenna with a customized slot. A passive mechanical switch is connected across this slot and provides the frequency switching as it is activated and deactivated. The integration of this switch with the antenna is achieved using a co-simulation method. Furthermore, the cold-temperature reactive LCE triggers the switch when a temperature violation has occurred, thereby switching the operating frequency of the sensor based on temperature changes. Additionally, a high-dielectric constant substrate and a single matching network that operates at two discrete frequencies are used to design our compact frequency-domain temperature sensor. Moreover, based on the RFID platform, this sensor operates effectively in close-proximity to other sensors. Also, is provides identification and temperature information through an autonomous, continuous, and cost-effective design. Therefore, the proposed sensor has the potential for operation in the Internet of Things (IoTs) applications, where large amounts of data is collected from numerous sensors to extract valuable information for the benefit of users, manufacturers, and delivery companies in the virtual domain of the internet. Finally, ANSYS HFSS and Circuit Designer are used for the simulation modeling. The performance of our sensor is validated using measurements and simulations that agree very well.