Radio communication without battery energy

Radio communication without battery energy

Engineers at the University of Washington have developed a wireless communication system called "ambient back reflection" that enables communication without battery energy.

This kind of Ambient backreflection (Ambient Backscatter) device enables information exchange through radio signals transmitted by existing TVs or mobile phones.

This wireless communication device can exchange information through the radio signals of existing TVs or mobile phones.

 

This small battery-free device can obtain energy from these radio frequencies, and then transmit information to another similar device using a moers' communication method. The authors of this study explained: "Our design avoids the expensive process of generating radio waves, and the back-reflection communication method is more energy-efficient than traditional radio communication. In addition, because it uses RF signals that already exist around us, it does not need dedicated power infrastructure for traditional back-reflection communication ."

The research team developed a prototype system using a credit card size device that delivers information between 45 and 75 cm at a 1 kbps speed. One device is installed with a touch sensor. When you click it, it will communicate with the second device. Then the LED light will flash to confirm that the signal has been received. Shyam Gollakota, assistant professor of computer science and engineering, is the lead researcher for the study. He explained: "This technology is expected to be applied in many fields, this includes wearable computers, smart home devices, and independent sensor networks."

The research team believes that this technology can be used to provide energy to smart sensors placed in any building for a long time. This technology can also be used to transmit information between wearable devices without worrying about battery issues. It may also provide a way to transfer funds between credit cards. The research team believes this technology may be applied to mobile phones. When the battery is exhausted, the phone can still obtain energy from the surrounding TV signals to send messages. The study author said: "Because this device avoids frequently maintained batteries and dedicated power infrastructure, it brings many new uses that were previously impossible or impractical. We believe that the environment back reflection technology provides a key building module for communications between popular devices. It is not only cheap, but also has almost no maintenance costs ."