Body-scale NFC for wearables: human-centric body-scale NFC networking for ultra-low-power wearable devices (Demo of UTokyo Kawahara Lab 2025)

TL;DR

This paper introduces a novel body-scale NFC networking system for wearables, utilizing Meander NFC and picoRing NFC technologies to extend communication range and improve robustness for ultra-low-power surface-to-multipoint interactions.

Contribution

It presents two innovative NFC technologies, Meander NFC and picoRing NFC, that significantly extend NFC coverage and reliability for wearable applications.

Findings

Meander NFC achieves body-scale coverage with stable small tag readout.

picoRing NFC extends communication range between wearable nodes.

Demonstration of a human-centric NFC network system.

Abstract

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.