Is It Possible to Charge Your Phone by Radio? (2)
Collect the radio emitted by the phone itself
In the past, dipole patch antennas were used to collect energy from radio waves, but because the efficiency of collecting electricity is too low, it has basically no practical application value. In order to solve this problem, some researchers try to use multi-band antennas to draw energy from broad-spectrum radio bands, convert electromagnetic waves and radio signals with a certain intensity into direct current, and even from the radio signals emitted by mobile phones and computer equipment themselves to collect energy.
Multi-band antennas can detect, utilize and reflect radio waves, which not only avoids wasting too much power on signal transmission but also greatly increases the battery life of smart devices. At present, the energy collected using multi-band antennas can reach about 5 milliwatts.
If the collection efficiency is further improved, the collection power can be increased to 20 milliwatts, which can power low-energy electronic devices such as mobile phones, sensors, wearable devices, and microphones. Of course, low levels of energy harvesting will not affect the quality of cell phone calls or data transfers. The main problem is that the amount of energy absorbed by the radio frequency will fluctuate up and down, and the closer the distance to the signal source, the stronger the energy.
Using metamaterials can dramatically improve the efficiency of energy harvesting from radio waves, new research finds. A metamaterial is an artificial layered material formed by etching periodic patterns into the surface of the material. The unique size and proximity of these patterns to each other can result in energy absorption rates approaching 100%. This is a more efficient way of harvesting energy than conventional antennas. Because meta surface technology absorbs electromagnetic energy much higher than conventional antennas, it can greatly reduce the surface area required for energy harvesting. This can reduce the size of the battery and make it easier to integrate into various small wireless electronic devices.
Harvesting energy from radio waves is expected to be used in many fields, including wearables, smart homes, sensors, and other devices that require an uninterrupted power supply. In particular, smart sensors using this technology can be permanently implanted in buildings or facilities that people cannot easily open, such as bridges, to monitor the health of reinforced concrete and send an alarm if cracks are detected.
In conclusion, harvesting energy from the surrounding environment has its own unique uses. Extracting power from radio waves is a powerful addition to low-energy devices that require an uninterrupted power supply, and as an attractive cutting-edge technology, people are naturally excited about its future.
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