A Battery Free Cell Phone: Becoming A Reality

Phone manufacturing companies are continually endeavoring to make new phones that can run longer on a solitary battery charge. On the other hand, a team of engineers at the University of Washington has done the unthinkable, They built a battery free cell phone that doesn’t need a battery at all.

Battery Free Cell Phone
Image Source: MARK STONE/UNIVERSITY OF WASHINGTON

Though, it doesn’t look like a normal cell phone that we have been using. It’s a basic printed circuit board with the exposed rudiments to make telephone calls conceivable, including a microphone, number pad and an earphone jack. It may not be near to the style of any high end phone, but you don’t need to stress over the phone’s charge biting the dust without any warning.

The telephone still uses power, it just collects vitality from different sources, for example, daylight and radio waves. This phone has photo-diodes to absorb photons from light sources and generate electricity. It also has an antenna to produce electricity out of radio waves.

At the point when radio waves interact with an antenna, the waves incite power to course through it. But this has a limitation, because radio wave propagation follows the inverse-square law. It means, the strength of a radio signal weakens by the square of the distance from the transmitter. So, it won’t take too long before you’re too far from a transmitter to generate enough electricity to do any substantial work. In order to make a call, a phone needs continuous power. To solve this issue, the team designed a base station that transmits RF signals to the battery-free cell phone. With both the base station and the photo-diodes, the phone can operate up to 50 feet or about 15 meters from the base station.

Making a call is simple. You simply punch in the telephone number you need to call and the circuit board sends this data by means of radio waves to the base station in a digital packet. The base station takes this information and makes a call on Skype to a cellular network. The station keeps on staying in contact with the phone using radio waves, allowing the caller to hear the other side of the conversation. To talk, you simply need to hold down a button to enact the mouthpiece.

Though still in development, but holds a great future.

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