An Autonomous Wireless Sensor Node Based on Hybrid RF Solar Energy Harvesting

<div>Measured rectification efficiency <i>ƞ</i> versus input power <i>P</i><sub>IN</sub> and load. (a) The efficiency <i>ƞ</i> for the 1-stage rectifier. (b) The efficiency <i>ƞ</i> for the 4-stage rectifier.</div>

Wireless Power Transfer

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Figure 8

Figure 8: An Autonomous Wireless Sensor Node Based on Hybrid RF Solar Energy Harvesting 