Battery Less Cell Phones

For the first time, ever scientists have managed to develop the technology of our dreams. Researchers belonging to the University of Washington have created a first battery less cell phone.

How it works?

The phone uses ambient radio signals and light to produce the meager number of micro-watts of power to operate. Team also tested Skype calls. It showed that it could relay speech and converse with a base station.

The makers of this technology have eliminated the power consuming process. It no longer converts analog signals that convey sound waves into digital data that a phone can interpret.

The team behind this innovation used the idea of the microscopic vibrations within the phone’s microphone or the speaker. This motion is translated into changes in standard analog radio signal emitted by cellular base stations by using an attached antenna.

Vibrations convey speech via the microphone to encode speech patterns in the reflected signals. Moreover, encoded radio signals converts the into sound vibrations. Finally, registered by the phone’s speaker.


However, there are limitations. E.g it does not yet have a touchscreen or an internet connection.

Moreover, it is not yet capable of making and receiving signals at the same time so the caller must hold down a button while speaking and release it to listen to the reply, like a walkie-talkie. Lacking power for a speaker, the user must use an earphone to listen to a call.

The researchers explained that the current model could only operate within few meters of the base station. However, if they could make use of licensed mobile network frequencies this limitation of distance could be overcome.

The team plans on improving the device’s operating range and encrypting calls to make them secure. A low power E-ink screen visual display is being used. In addition, ability to stream a video on this device is also being worked on.


2 Replies to “First Battery Less Cell Phone is Powered by Radio Waves”

  1. The developments in cell-phones are just amazing. Given that mine keeps losing its charge, batteryless phones are very much of interest. Will watch out for more news.

    Joy – Blogging After Dark

    1. Hi Joy,
      Cell phones have become incredibly advanced in a short pace of time. They keep on improving.
      Thank you for comment at Techmash. Have a great day 🙂

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