Foreign media reports, the University of Washington School of Electronic Engineering students recently developed a new WiFi technology, its most prominent feature is less than one ten thousandth of current WiFi.
The emerging technology cycle diagram released by Gartner last year shows that IoT becomes the most anticipated emerging technology in 2016 and the related IOT platform is also strongly concerned. IoT technology will mature in the next 5 to 10 years. By 2020, the total number of connected devices will reach or exceed 50 billion. The Internet of Things will include many devices in the home, ranging from smart thermostats and wearables to smart refrigerators.
Internet of things black technology: new WiFi technology without power consumption
Batteries are sometimes the root cause of mobile devices and sensors. They are not reliable, must be charged, or replaced on a regular basis, and could become the biggest weakness for IoT. To this end, researchers at the University of Washington in Houston think of a good idea: By capturing energy from existing radio, television and other wireless signals, they have developed a device that allows low-energy devices such as sensors, wearable devices, Ways to network without batteries or wires.
At present, foreign media reports, the University of Washington School of Electronic Engineering students recently developed a new WiFi technology, its most prominent feature is less than one ten thousandth of current WiFi. Most importantly, high-volume IoT devices can also be charged through reverse wifi technology. The technology has been "MIT Technology Review" (MIT Technology Review) named "2016 Top Ten Science and Technology Breakthrough" and has been applied to the University of Washington campus.
Internet of things black technology: WiFi technology does not consume electricity charging
Transmitting radio waves "draws" power from the radio
The technology, called "PassiveWi-Fi" (passive WiFi), is almost the same as a daily router, but more energy efficient. For example, the current router has a transmit power of 100 milliwatts, whereas the PassiveWi-Fi router has a transmit power of only 10-50 microwatts, just one in 10,000.
The new WiFi technology works similar to an RFID chip using the electromagnetic back-reflex (Wi-Fibackscatter) communication technology. Current WiFi technologies provide signals by consuming electricity; unlike the technology, which selectively reflects radio waves and "draws" power from radio waves.
VamsiTalla, a researcher at the project, said: "The device using PassiveWi-Fi technology does not transmit any signal itself, it only generates WiFi packets by reflection. Therefore, Very low radio transmission technology. "
According to the researchers, PassiveWi-Fi's work is divided into three steps: first, a simple device needs to be installed on the wall to send analog waves to PassiveWi-Fi sensors. Much of the power is spent in the process, and the sensor consumes little power.
Next, the sensor will accept the analog wave, and then digital conversion, generate Wifi packets. Finally, the device can deliver network data to a handset or router at 11 Mbps per second (faster than Bluetooth, but slower than some home broadband).
The low-power WiFi device comes from a new communications system called Wi-Fi backscatter (Wi-Fibackscatter) that uses radio frequency as a source of electrical power and does not even need batteries in the future.
Wi-Fi wireless charging gets energy directly from the air
With the help of this technology, the future IoT devices may no longer need batteries, but directly from the air for energy.
They invented the black technology, known as the "power over Wi-Fi" system, which allows us to charge Wi-Fi devices for devices within 28 feet (about 8.5 meters) .
The system consists of two parts, a receiver (router), and a custom sensor. "The sensor's goal is to collect RF power and convert it to DC power," explains Vamsi Talla, a project researcher. "The second one is our receiver, and we have a custom-made solution for it. Software modifies the way the router becomes a power source and at the same time acts as a traditional router. "In other words, you just need to upgrade your legacy Wi-Fi router to co-exist data and energy transfers , Do not interfere with each other. Or, to be more precise, this technology simply makes the most of the existing power generated by the router.
In addition to using RF as a power source, University of Washington engineers also found ways to re-use existing Wi-Fi signals to provide networking capabilities for batteryless devices; this technology, known as Wi-Fi Backpack, is claimed to be the first to The solution to link batteryless devices to Wi-Fi infrastructure is based on earlier research that enables low-power devices such as temperature sensors to capture energy from broadcast, television and wireless signals.
The University of Washington said the challenge that this new technology needs to overcome is that traditional low-power networks such as Wi-Fi and Bluetooth consume two to two times the amount of energy they can capture from television broadcasts, cellular networks or Wi-Fi transmitters three times. Wi-FiBackscatter, a communication mechanism that allows radio-powered devices to encode data by reflecting or not reflecting signals from Wi-Fi routers; existing devices and sensors can detect those reflected by those reflections The resulting Wi-Fi signal strength varies. And because the Wi-FiBackscatter is just a reflection, not a wireless signal, it can communicate with network-connected devices in less than 10mW.
Internet of things black technology: WiFi technology does not consume electricity charging
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