Research Article
A Dual-Band Antenna for RF Energy Harvesting Systems in Wireless Sensor Networks
Table 1
Characteristics of various energy sources and harvested power.
| Source | Source power | Harvested power |
| Ambient light | | | Indoor | 0.1 mW/cm2 | 10 μW/cm2 | Outdoor | 100 mW/cm2 | 10 mW/cm2 | Vibration | | | Human | 0.5 m @ 1 Hz 1 m/s2 @ 50 Hz | 4 μW/cm2 | Industrial | 1 m @ 5 Hz 10 m/s2 @ 1 kHz | 100 μW/cm2 | Thermal energy | | | Human | 20 mW/cm2 | 30 μW/cm2 | Industrial | 100 mW/cm2 | 1–10 mW/cm2 | RF | | | Cell phone | 0.3 μW/cm2 | 0.1 μW/cm2 |
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