Printed Chipless Antenna as Flexible Temperature Sensor
Printed Chipless Antenna as Flexible Temperature Sensor
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DOI：
10.1109/jiot.2021.3051467
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发表时间：
2021-03-15
影响因子：
10.6
通讯作者：
Dahiya, Ravinder
中科院分区：
文献类型：
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作者：
Bhattacharjee, Mitradip;Nikbakhtnasrabadi, Fatemeh;Dahiya, Ravinder
可穿戴和便携式系统上的设备数量不断增加，带来了集成复杂性、更高的功耗要求和更低的用户舒适度等挑战。在这方面，多功能设备的开发可能会有很大的帮助，因为它们将以较少的设备提供相同的功能。在此，我们提出了一种印刷在聚氯乙烯（PVC）基板上的双功能柔性环形天线。与聚（3，4-乙撑二氧噻吩）：聚苯乙烯（PEDOT：PSS）部分作为印刷结构的一部分，所提出的天线也可以作为一个温度传感器通过电阻的变化。天线在1.2和5.8 GHz频率下谐振。当温度从25摄氏度增加到90摄氏度时，温度感测部分的欧姆电阻减小了大约70%。所开发的天线，其特征在于使用矢量网络分析仪（VNA）在相同的温度范围内和S11幅度被发现改变了类似的3.5分贝。还在GSM频率范围内测量了感应电流，并且对于感测天线观察到类似于1.2%/摄氏度的灵敏度。柔性天线也进行了评估，在横向和交叉弯曲的条件下，响应被认为是稳定的交叉弯曲。由于这些独特的功能，所提出的天线传感器可以在通过可穿戴设备，智能标签和物联网（IoT）实现无处不在的传感方面发挥至关重要的作用。
The ever-increasing number of devices on wearable and portable systems comes with challenges such as integration complexity, higher power requirements, and less user comfort. In this regard, the development of multifunctional devices could help immensely as they will provide the same functionalities with lesser number of devices. Herein, we present a dual-function flexible loop antenna printed on polyvinyl chloride (PVC) substrate. With a poly(3,4-ethylenedioxythiophene): polystyrene (PEDOT:PSS) section as part of the printed structure, the presented antenna can also serve as a temperature sensor by means of change in resistance. The antenna resonates at 1.2- and 5.8-GHz frequencies. The ohmic resistance of the temperature sensing part decreases by similar to 70% when the temperature increases from 25 degrees C to 90 degrees C. The developed antenna was characterized using a vector network analyzer (VNA) in the same temperature range and the S11 magnitude was found to change by similar to 3.5 dB. The induced current was also measured in the GSM frequency range and sensitivity of similar to 1.2%/degrees C was observed for the sensing antenna. The flexible antenna was also evaluated in lateral and cross-bending conditions and the response was found to be stable for the cross-bending. Due to these unique features, the presented antenna sensor could play a vital role in the drive toward ubiquitous sensing through wearables, smart labels, and the Internet of Things (IoT).