A Patch Antenna with Liquid Crystal Elastomer Switching for Passive RFID Temperature Sensing
A Patch Antenna with Liquid Crystal Elastomer Switching for Passive RFID Temperature Sensing
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DOI：
10.1109/apusncursinrsm.2019.8888801
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Yousuf Shafiq;S. Georgakopoulos;Hyun Kim;Cedric P. Ambulo;T. Ware
中科院分区：
文献类型：
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作者：
Yousuf Shafiq;S. Georgakopoulos;Hyun Kim;Cedric P. Ambulo;T. Ware
本文介绍的天线设计支持新一代无电池RFID传感技术，其中天线单元以受控的方式动态适应不断变化的环境。具体地说，我们提出了一种基于温度阈值跨越的可逆和重复地将工作频率从905 MHz切换到923.5 MHz的传感天线。所开发的天线是与RFID IC匹配的贴片天线，并与定制的插槽集成在一起。该天线通过使用一种新型的热响应聚合物或液晶弹性体(LCE)来改变其工作频率，这种聚合物或LCE是可编程的，并且是可逆操作的。此外，4D打印的LCE结构将与一个超微型机械开关(USMS)相耦合，当LCE被激活时，该开关可使插槽短路。最后，当热激励被移除时，开关返回到断开状态。开关的短路和开路状态将允许天线结构的频移。本文通过仿真和测量，描述了贴片天线的频移方法和新型的LCE开关机制。
The antenna design presented here supports a new generation of battery-free RFID sensing technology in which the antenna element dynamically conforms to the changing environment in a controlled manner. Specifically, we propose a sensing antenna that reversibly and repeatedly switches operating frequencies from 905MHz to 923.5 MHz based on a temperature threshold crossing. The developed antenna is a patch antenna matched to an RFID IC and integrated with a customized slot. The antenna shifts its operating frequency by using a novel thermal responsive polymer or Liquid Crystal Elastomer (LCE) which is programmable and operates reversibly. Furthermore, 4D printed LCE structures are to be coupled with an Ultra Subminiature Mechanical Switch (USMS) which shorts the slot when the LCE is activated. Finally, as the thermal excitation is removed, the switch returns to the open state. The short and open states of the switch will enable the frequency shift of the antenna structure. In this paper, the methodology of the frequency shift in the patch antenna and the novel LCE switch mechanism are described through simulation and measurements.