A Tightly Integrated Multilayer Battery Antenna for RFID Epidermal Applications
A Tightly Integrated Multilayer Battery Antenna for RFID Epidermal Applications
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DOI：
10.1109/tap.2017.2780899
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发表时间：
2018-02
影响因子：
5.7
通讯作者：
M. Caccami;M. Hogan;M. Alfredsson;G. Marrocco;J. Batchelor
中科院分区：
文献类型：
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作者：
M. Caccami;M. Hogan;M. Alfredsson;G. Marrocco;J. Batchelor
为了在日常生活中接受生物集成设备，必须开发对皮肤具有最小侵入性的无线电系统，并且它们必须具有超薄的本地电源，以支持数据记录功能而不影响形状一致性。这一贡献提出了一种紧密集成的多层电池-天线系统($65\x 23$mm2)，即超薄(仅$200~\MU\Text{m}$)、灵活且重量小于1$g$，使其适合于表皮应用。电池的负极(阳)集电器是一种射频识别标签天线，由导电聚合物(PEDOT：PSS)涂覆作为负极材料。由于电池是一个动态设备，需要进行放电，天线设计必须包括导电聚合物的可变介电特性，这里首先在UHF频段表征实际充放电电池条件下的介电特性。因此，通过将标签天线(−19.6dBI，870 MHz)直接放置在志愿者的前臂上时，通过测量标签天线的实现增益来评估原型复合设备的通信性能。1.3-3m的读取范围适合于用户接近配备阅读器的闸机时，偶尔从表皮数据记录器下载数据。
For the acceptance of biointegrated devices in daily life, radio systems must be developed, which are minimally invasive to the skin, and they must have ultralow-profile local power sources to support data-logging functionality without compromising shape conformability. This contribution proposes a tightly integrated multilayer battery-antenna system ( $65 \times 23$ mm2), that is, ultrathin (just $200~\mu \text{m}$ ), flexible, and lighter than 1 $g$ , making it suitable for epidermal applications. The negative electrode (anode) current collector of the battery is a radio frequency identification tag antenna coated by a conductive polymer (Pedot:PSS) working as anode material. Since the battery is a dynamic device, subjected to discharging, the antenna design must include the variable dielectric properties of the conductive polymer which are here first characterized in the UHF band for real charge/discharge battery conditions. The communication performance of the prototype composite device is hence evaluated through the measurement of the realized gain of the tag antenna (−19.6 dBi at 870 MHz) when it is placed directly onto a volunteer’s forearm. The read range of 1.3–3 m is suitable for occasional data download from the epidermal data logger when the user comes close to a reader-equipped gate.