Wireless and battery-free radio-frequency (RF) sensors can be used to create physical spaces that ambiently sense and respond to human activities. Making such sensors ultra-flexible and transparent is important to preserve the aesthetics of living environments, accommodate daily activities, and functionally integrate with objects. However, existing RF sensors are unable to simultaneously achieve high transparency, flexibility, and the electrical conductivity required for remote room-scale operation. Here, we report 4.5 µm RF tag sensors achieving transparency exceeding 90% that provide capabilities in room-scale ambient wireless sensing. We develop a laser-assisted water-based adhesion-reversion process to digitally realize computer-aided RF design at scale. By individually tagging multiple objects and regions of the human body, we demonstrate multiplexed wireless tracking of human-environment interactions and physiological signals at a range of up to 8 m. These radio-frequency identification sensors open opportunities for non-intrusive wireless sensing of daily living spaces for applications in health monitoring and elderly care.

无线和免电池射频 (RF) 传感器可用于创建能够感知环境并响应人类活动的物理空间。使此类传感器变得超灵活和透明对于保持生活环境的美观、适应日常活动以及与物体功能集成非常重要。然而，现有的射频传感器无法同时实现远程房间规模操作所需的高透明度、灵活性和导电性。在此，我们报告了透明度超过 90% 的 4.5 µm RF 标签传感器，可提供房间规模的环境无线传感功能。我们开发了一种激光辅助水基粘附回复工艺，以数字方式大规模实现计算机辅助射频设计。通过单独标记人体的多个物体和区域，我们展示了对人类环境交互和生理信号的多路无线跟踪，范围可达 8 m。这些射频识别传感器为健康监测和老年护理应用中日常生活空间的非侵入式无线传感提供了机会。