Near Field Communication (NFC) is a promising technology for ultra-low-power wearables, yet its short communication range limits its use to narrow-area, point-to-point interactions. We propose a body-scale NFC networking system that extends NFC coverage around the body, enabling surface-to-multipoint communication with distributed NFC sensor tags. This demonstration introduces two key technologies: Meander NFC and picoRing NFC. First, Meander NFC expands a clothing-based NFC networking area up to body scale while enabling a stable readout of small NFC tags occupying 1% of the coverage area. Meander NFC uses a meander coil which creates a spatially confined inductive field along the textile surface, ensuring robust coupling with small tags while preventing undesired electromagnetic body coupling. Second, picoRing NFC solves the weak inductive coupling caused by distance and size mismatches. By leveraging middle-range NFC and coil optimization, picoRing NFC extends the communication range to connect these disparate nodes between the ring and wristband.

翻译：近场通信（NFC）是超低功耗可穿戴设备的一项前景广阔的技术，但其短通信距离限制了其仅能用于窄区域点对点交互。我们提出了一种体域NFC网络系统，可将NFC覆盖范围扩展至人体周围，实现与分布式NFC传感器标签的表面至多点通信。本演示介绍了两项关键技术：Meander NFC与picoRing NFC。首先，Meander NFC将基于织物的NFC网络区域扩展至体域尺度，同时能稳定读取仅占覆盖区域1%面积的小型NFC标签。Meander NFC采用蜿蜒线圈，在织物表面产生空间受限的感应磁场，确保与小型标签的稳健耦合，同时避免不良的电磁人体耦合。其次，picoRing NFC解决了因距离与尺寸失配导致的弱感应耦合问题。通过利用中程NFC与线圈优化技术，picoRing NFC扩展了通信范围，以连接戒指与腕带之间的这些异构节点。