The American college of electrical engineering at the university of Washington's students have developed a new wi-fi technology, its biggest characteristic is one over ten thousand of the energy consumption is less than the current wi-fi. The technology called "Passive wi-fi" (Passive wi-fi), and the current router we use almost the same, just more energy efficient. For example, the current router transmission power is 100 milliwatts, Passive wi-fi router transmission power was only about 10 ~ 50 amounts, only one over ten thousand.

New wi-fi technology is similar to the working principle of RFID chip, using backward reflection of electromagnetic communication technology. The wi-fi technology USES electricity to provide signal; And the technology is different, it can selectively reflects radio waves, can "learn" power supply energy from the waves.

The project researchers Robert vast DaErLa (Vamsi Talla) said: "USES the Passive wi-fi technology equipment itself does not transmit any signal, it only generated by means of reflection for wi-fi according to package. Therefore, such a kind of very low energy consumption of wireless transmission techniques."

Other researchers involved in the project research Bryce kohl rogge (Bryce Kellogg) said: "at the moment it is difficult to say it is to what extent will extend the battery, because the battery life is decided by many factors, such as the screen brightness, but the use of Passive wi-fi technology will make the equipment with closed wi-fi module is almost the same."

According to the researchers, Passive wi-fi work is divided into three steps: first need to install a simple device on the wall, to send the simulation wave to Passive sensor of wi-fi. Most of the cost in the process, and sensor hardly take charge.

Next, the sensor will accept analog wave, and then to digital conversion, generate wi-fi data packets.

Finally, the equipment can at 11 megabits per second per second (faster than bluetooth but slower than home broadband) to mobile phones or router network data transmission.

At present, the Technology has been the MIT Technology Review (MIT Technology Review) nominated for the "20160" big breakthrough of science and Technology, and has practical application in the campus at the university of Washington. It is understood that the technology can connect to any wi-fi equipment within 30 meters, also can wear a wall.

Most importantly, the production cost of each device is less than a dollar