Some years before the basic requirement of any person is simply Food, Cloths, and Shelter but today one more thing is added to this queue at that is Cell-phones . Cell-Phones had become the basic requirements of today user . No work is remained now a days that cannot be performed using a smartphones. Bu the biggest problem that comes with smartphone user is to charge the phone, but suppose a lifestyle where you have to just use the smartphone without getting worry about its battery.
Phone manufacturers are constantly striving to create new products that can run longer on a single battery charge but a team of engineers at the University of Washington (UW) has gone the extra mile: They built a cell phone that doesn't need a battery at all. When radio waves interact with an antenna, the waves induce electricity to flow through the antenna.
While radio waves carry energy and we're surrounded by transmitters generating these waves, this doesn't mean you could power your home by hooking all your electronics to antennas. That's because radio wave propagation follows the inverse-square law — the strength of a radio signal weakens by the square of the distance from the transmitter. It doesn't take long before you're too far from a transmitter to harvest enough electricity to do useful work.
Making a phone call requires that the device you're using has continuous power. "You can't say hello and wait for a minute for the phone to go to sleep and harvest enough power to keep transmitting," said paper co-author Bryce Kellogg, a UW electrical engineering doctoral student, in a press release. "That's been the biggest challenge — the amount of power you can actually gather from ambient radio or light is on the order of 1 or 10 microwatts. So real-time phone operations have been really hard to achieve without developing an entirely new approach to transmitting and receiving speech."
To get around that problem, the team designed a base station that transmits RF signals to the battery-free cell phone. With both the base station and the photodiodes, the phone can operate up to 50 feet or about 15 meters from the base station.
Making a call is simple. You just punch in the phone number you want to call and the circuit board sends this information via radio waves to the base station in a digital packet. The base station takes this data and makes a call on Skype to a cellular network. The station continues to remain in contact with the phone via radio waves, allowing the caller to hear the other side of the conversation. To speak, you just have to hold down a button to activate the microphone.
The simple design means the phone operates on just a few microwatts. Despite the low power approach, the result is pretty amazing.
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