"Air charge" is what ghost, my wireless charger has not bought it!

No matter how small the Internet device requires a battery or power cord. But it will soon change. This technology is about to be commercialized by allowing the device to ingest electricity from the surrounding TV, radio, cell phone, or Wi-Fi signal to work and communicate.

Breakthrough

A new wireless device that can power itself and communicate with neighboring radio signals, such as Wi-Fi.

Meaning

Internet devices will get rid of the battery and power cord and open up a lot of new applications. No matter how small the Internet device requires a battery or power cord. But it will soon change. This technology is about to be commercialized by allowing the device to ingest electricity from the surrounding TV, radio, cell phone, or Wi-Fi signal to work and communicate.

The main researcher of this technology

University of Washington, Texas Instruments, University of Massachusetts (Amherst).

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Researchers at the University of Washington who developed the technology showed internet thermometers, motion sensors, and even cameras that get power in this way.

Transmitting electricity wirelessly is not a new concept. But it is difficult to make the device communicate without regular power, because the radio signal is very energy-consuming, and the air waves from radio, television and other means of communication are less energetic.

Shyamnath Gollakota and his colleague, Joshua Smith, have proved that a weak radio signal does satisfy the power requirements of an Internet device, and one of their devices uses the principle of the called backscatter (backscattering), not sending the original signal, Instead, it selectively reflects incoming radio waves and creates new signals-a bit like an injured climber who uses the sun and mirrors to send SOS messages. The device uses this technology to absorb some of its energy from its modified signals and to power itself.

"We can do free communication," said Gollakota, the RFID chip for contactless smart cards for high-volume transmissions also relies on backscatter, but they require specialized readers and can only communicate within a few inches, because the reflected signal is weak and the reader itself interferes.

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One of the technical versions of the University of Washington, known as passive Wi-Fi (passive Wi-Fi), is being commercialized by a derivative company Jeeva Wireless. Passive Wi-Fi uses a back-scattering Wi-Fi signal to connect a battery-free device to a traditional device, such as a computer or smartphone. In the test, the passive Wi-Fi prototype transmits data to 100 feet, enabling a wall-through connection. Doing so requires changing the Wi-Fi access point software to produce an additional signal for use by passive Wi-Fi devices, which can slightly increase power consumption.

The power consumption of passive Wi-Fi is only one out of 10,000 of the current Wi-Fi chipset, and it is 1 per thousand of the power consumption of small connected devices using Bluetooth LE and ZigBee communication standards, says Smith. Devices that use passive Wi-Fi communication-such as a surveillance camera-can take advantage of the power generated by the subsequent scattering of Wi-Fi signals or signals such as TVs and broadcasts to supply electricity to other circuits.

The researchers believe that small, passive Wi-Fi devices are extremely inexpensive to manufacture and may cost less than $1. Future smart homes, surveillance cameras, temperature sensors and smoke alarms should no longer have to replace batteries.

"Air charge" is what ghost, my wireless charger has not bought it!