Electrical engineers in San Diego, California, have developed an ultra-low-power Wi-Fi radio that allows IoT smart devices to communicate with existing Wi-Fi networks at a power consumption of just 28 microwatts, one-fifth of the capacity of an existing Wi-Fi radio.
它能在最远 21 米距离上以 2 Mbps 的速度传输数据，这足以传输音乐和大部分 YouTube 视频。
Dinesh Bharadia, a professor of electrical and computer engineering, says the device can last for years using a single coin battery. Existing Wi-Fi radios typically consume hundreds of milliwatts of power to connect Toy-Fi receivers and IoT devices, so they require large batteries or frequent charges or external power supplies.
The researchers used “backscatter” technology to achieve ultra-low power consumption, a technique that has been used in spy devices.