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该论文提出了一种用于WiFi反向信道无线供电的共集成天线能量收集器，解决了小尺寸天线在2.4GHz WiFi低功率环境下能量收集效率低和冷启动困难的问题。通过共集成天线和整流器设计，实现了极低功耗的无线能量收集。
power sensors can enable perpetually powered sensors for several monitoring and asset-tracking IoT applications. Small form factor is often desirable to ensure unobtrusive sensors. However, typical 2.4GHz WiFi output power of <+20dBm implies ~-30dBm (1μW) incident power (assuming free space path loss) at a ~3m range. This presents a fundamental trade-off since small antenna area can further restrict the wireless power available to the rectifier/harvester. In addition, the time-varying nature of RF wireless powering implies that the energy-harvesting approach must accommodate cold start. In this work, we address the challenge of simultaneously achieving small form factor, μW-scale wireless input sensitivity, and operation at relatively high frequency (2.4GHz) by co-designing the antenna, rectifier, and DC-DC converter,
Kamala Raghavan Sadagopan1, Jian Kang1, Yogesh Ramadass2, Arun Natarajan1
Oregon State University, Corvallis, OR; 2Texas Instruments, Santa Clara, CA 1 Leveraging the ubiquitous WiFi infrastructure to wirelessly