Review Article
RF Energy Harvesting for Ubiquitous, Zero Power Wireless Sensors
Table 2
Characteristics of wireless power transmission (WPT) [
1].
| | Receiver/characteristics | WPT via radio waves | Resonant coupling | Inductive coupling |
| | Field | Electromagnetic (EM) | Resonance (electric, magnetic, or EM) | Magnetic | | Receiver | Antenna | Resonator | Coil | | Efficiency | Low to high | High | High | | Distance | Short to long | Medium | Short | | Power | Low to high | High | High | | Safety | EM | None | Magnetic | | Regulation | Radio wave | Under discussion | Under discussion |
|
|
