Wearable Flexible Lightweight Modular RFID Tag With Integrated Energy Harvester
Wearable Flexible Lightweight Modular RFID Tag With Integrated Energy Harvester
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DOI：
10.1109/tmtt.2016.2573274
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发表时间：
2016-07-01
影响因子：
4.3
通讯作者：
Rogier, Hendrik
中科院分区：
文献类型：
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作者：
Lemey, Sam;Agneessens, Sam;Rogier, Hendrik
一种新型可穿戴射频识别 (RFID) 标签具有传感、处理和决策能力，可在 2.45 GHz RFID 超高频 (SHF) 频段运行。该标签由集成光采集器供电，并配有灵活的电池作为能量缓冲器。所提出的有源标签具有出色的耐磨性、非常高的读取范围、增强的功能、与各种低功耗传感器的灵活接口，以及通过创新的整体微波系统设计范例（从早期阶段就考虑到天线设计）扩展的系统自主性。具体来说，设计并优化了具有单极辐射方向图的专用纺织短路圆形贴片天线，以在工作频段内高效稳定地工作。在此过程中，通过将其表面重新用作光能收集、传感、处理和收发器硬件的集成平台，纺织天线的功能得到增强，而不会牺牲天线性能或佩戴者的舒适度。通过在自由空间条件下测量其独立和贴身特性来验证 RFID 标签。此外，现实场景中的测量结果表明，在非视距室内传播条件下，室内读取范围可达 23 m，使得位于另一个房间的读取器能够进行询问。此外，当每 60 秒执行一次传感和处理时，RFID 平台仅消耗 168.3 μW。
A novel wearable radio frequency identification (RFID) tag with sensing, processing, and decision-taking capability is presented for operation in the 2.45-GHz RFID superhigh frequency (SHF) band. The tag is powered by an integrated light harvester, with a flexible battery serving as an energy buffer. The proposed active tag features excellent wearability, very high read range, enhanced functionality, flexible interfacing with diverse low-power sensors, and extended system autonomy through an innovative holistic microwave system design paradigm that takes antenna design into consideration from the very early stages. Specifically, a dedicated textile shorted circular patch antenna with monopolar radiation pattern is designed and optimized for highly efficient and stable operation within the frequency band of operation. In this process, the textile antenna's functionality is augmented by reusing its surface as an integration platform for light-energy-harvesting, sensing, processing, and transceiver hardware, without sacrificing antenna performance or the wearer's comfort. The RFID tag is validated by measuring its stand-alone and on-body characteristics in free-space conditions. Moreover, measurements in a real-world scenario demonstrate an indoor read range up to 23 m in nonline-of-sight indoor propagation conditions, enabling interrogation by a reader situated in another room. In addition, the RFID platform only consumes 168.3 mu W, when sensing and processing are performed every 60 s.