Cell phone without battery

Hello friends, my name is Arjun Gupta and today we see "A CELL PHONE WITHOUT BATTERY".

Introduction-

UW  engineers have designed the first battery free cellphone that can send and receive calls using a few microwatts of power.

Phone company or manufacturers are continuously trying to create a new technology that can run long on a single battery charge but the team of engineering at the University of Washington (UW) has gone the extra step: They create a cell phone that does not need a battery to run cell phone basic function like calling obviously.

The phone created by the engineers of UW does not look like original cell phone. It is a simple printed circuit board with the basic functionality of calling, including a microphone, number pad and headphone jack. But this typical circuit phone did not give you the feel of a real phone, but you do not have to worry about battery dead problem.

Working of Battery-less cell phone-

This is still uses the electricity, it just generates the energy from sources like sunlight and radio waves. the team of UW uses photo-diode to absorb the photon from the light and generate the electricity. To generate electricity from the radio signal, the just need an antenna. When radio waves make contact with the antenna, the waves combine with the electricity to flow through the antenna. Yes, it is true, you can actually generates electricity through radio waves.

While radio waves carry energy and we are surrounded by transmitter, which generates waves, this does not mean that you could power your all electronic appliances by attaching antenna to them, because radio wave propagation follow the inverse law- This law trying to say that, strength of radio signal decreases with the increasing in the distance, which means that the phone does not work when it is very far from the transmitter or radio wave generator.

For making a phone call requires continuous power to the device, if not then your phone automatically disconnect the call, the total amount of power gather from the radio and light is about 1 or 10 microwatts. Thus it is the main problem for the engineer is to continuous connect phone with radio signal.

To overcome this problem, the team designed a base station that generates RF signal to the cell phone, so with help of the base station and photo diode, the phone can operate from the distance of 15 meter. 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.

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