Electrically‐Shielded Coil‐Enabled Battery‐Free Wireless Sensing for Underwater Environmental Monitoring (Adv. Sci. 14/2025)

Battery-free Wireless Sensing System The cover image features a battery-free wireless sensing system for environmental monitoring in conductive underwater environments. In article number 2414299, Xin Zhang, Ke Wu, Xia Zhu, and Stephan Anderson introduce electrically-shielded coils with dual-layer conductors to reduce interference and enhance antenna stability. Integrated with a metamaterial-enhanced reader antenna and a 3-axis sensor antenna, this NFC-based system enables real-time saltwater monitoring.