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Mobile Phone which can run without battery

Mobile Phone which can run without battery
One of the biggest problem today smartphone face is the battery problem, almost every one of us is facing the problem of battery on our smartphone. But wait what if I say scientist has created a mobile phone which can work without it, interesting isn’t it?

A mobile phone that requires no batteries is an interesting proposition. While not a smartphone, this device could prove to be extremely useful for some, and mark the origin of a battery-less mobile tech industry. Researchers at the University of Washington (UW) have created a battery-free cellphone which operates using energy harvested from ambient radio signals and light. The device only requires 3.5 microwatts for continuous operation and was demonstrated making Skype calls.

While demonstrating the phone, Shyam Gollakota, associate professor at the University of Washington (UW) in the US said, "We have built what we believe is the first functioning cell phone that consumes almost zero power."

Researchers eliminated a power-hungry step in most modern cellular transmissions - converting analog signals that convey sound into digital data that a phone can understand.

So, the next question comes is how a mobile phone can work without a battery? Let try to understand, talking about this UW associate professor Shyam Gollakota explained: "To achieve the really, really low power consumption that you need to run a phone by harvesting energy from the environment, we had to fundamentally rethink how these devices are designed."

An example of the lateral thinking applied is that the converting of analog signals, that convey sound into digital data and vice-versa, is simply bypassed. No, A/D conversion takes place in the 'phone' as the tiny vibrations in a phone's microphone or speaker that occur when a person is talking into a phone or listening to a call are communicated as-is via analog radio antenna to a base station.

The tiny battery-less mobile phone was tested in transmitting voice, data, and button presses. Using Skype the phone could make and receive voice calls and even put callers on hold. Calls need a constant connection to the base station, unlike some IoT devices might, so keeping power flow for the call duration was a particular challenge.

Here is how it works: 

Currently, this mobile phone requires a custom base station to transmit and receive the radio signals. However, the tech could be integrated into standard cellular network infrastructure, or into home Wi-Fi routers that are so ubiquitous. In tests, the researchers found their mobile phone was functional within 31ft of the base station relying only on energy harvesting ambient radio signals. If the phone design included a tiny solar cell, roughly the size of a grain of rice, the device was able to communicate with a base station that was up to 50ft away.

While talking about the project, Vamsi Talla, a research associate at UW said, "You could imagine in the future that all cell towers or Wi-Fi routers could come with our base station technology embedded in it, and if every house has a Wi-Fi router in it, you could get battery-free cell phone coverage everywhere."

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