Magnetoquasistatic wireless power transfer can deliver substantial power to mobile devices over near-field links. Room-scale implementations, such as quasistatic cavity resonators, extend this capability over large enclosed volumes, but their efficiency drops sharply for centimeter-scale or misoriented receivers because the magnetic field is spatially broad and weakly coupled to small coils. Here, we introduce hierarchical resonators that act as selectively activated relays within a room-scale quasistatic cavity resonator, capturing the ambient magnetic field and re-emitting it to concentrate flux at a target receiver. This architecture reconfigures the wireless power environment on demand and enables localized energy delivery to miniature devices. Experimentally, the hierarchical link improves power transfer efficiency by more than two orders of magnitude relative to direct room-scale transfer and delivers up to 500 mW of DC power to a 15 mm receiver. We further demonstrate selective multi-relay operation and field reorientation for furniture-embedded charging scenarios. These results establish a scalable route to reconfigurable wireless power delivery for miniature and batteryless devices in room-scale environments.

翻译：准静态磁场无线能量传输能够在近场链路中向移动设备输送可观功率。诸如准静态空腔谐振器之类的室内尺度实现方案将该能力扩展至大封闭空间，但由于磁场空间分布宽广且与小线圈耦合较弱，其对厘米级或方向错乱的接收器效率急剧下降。本文引入层级谐振器作为室内尺度准静态空腔谐振器内选择性激活的中继器，其捕获环境磁场并重新辐射以将磁通量汇聚至目标接收器。该架构可按需重构无线能量传输环境，实现向微型设备的局域能量输送。实验表明：相比直接室内尺度传输，层级链路将能量传输效率提升超过两个数量级，并向15毫米接收器输送高达500毫瓦的直流功率。我们进一步演示了面向家具嵌入式充电场景的选择性多中继操作与磁场重定向。这些成果为室内尺度环境下微型及无电池设备的可重构无线能量传输建立了可扩展路径。