Zhu Qian, Zhang Wenjie, Zhu Wencheng, Wu Chao, Shi Jianping
School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing 210046, China.
Sensors (Basel). 2025 Jul 18;25(14):4488. doi: 10.3390/s25144488.
Microwave energy is ideal for wearable devices due to its stable wireless power transfer capabilities. However, rigid receiving antennas in conventional RF energy harvesters compromise wearability. This study presents a wearable system using a flexible dual-band antenna (915 MHz/2.45 GHz) fabricated via conformal 3D printing on arm-mimicking curvatures, minimizing bending-induced performance loss. A hybrid microstrip-lumped element rectifier circuit enhances energy conversion efficiency. Tested with commercial 915 MHz transmitters and Wi-Fi routers, the system consistently delivers 3.27-3.31 V within an operational range, enabling continuous power supply for real-time physiological monitoring (e.g., pulse detection) and data transmission. This work demonstrates a practical solution for sustainable energy harvesting in flexible wearables.
由于具有稳定的无线电力传输能力，微波能量对于可穿戴设备而言是理想之选。然而，传统射频能量采集器中的刚性接收天线会影响可穿戴性。本研究展示了一种可穿戴系统，该系统使用通过在模仿手臂的曲面上进行保形3D打印制造的柔性双频天线（915兆赫兹/2.45吉赫兹），将弯曲引起的性能损失降至最低。一种混合微带集总元件整流电路提高了能量转换效率。该系统通过商用915兆赫兹发射器和无线路由器进行测试，在工作范围内持续提供3.27 - 3.31伏电压，可为实时生理监测（如脉搏检测）和数据传输提供持续电力供应。这项工作展示了一种用于柔性可穿戴设备中可持续能量采集的实用解决方案。
