Abstract :
With mobile phones
becoming a basic part of life, the recharging of mobile phone batteries has
always been a problem. The mobile phones vary in their talk time and battery
stand by according to their manufacturer and batteries. All these phones
irrespective of their manufacturer and batteries have to be put to recharge
after the battery has drained out. The main objective of this current proposal
is to make the recharging of the mobile phones independent of their
manufacturer and battery make. In this paper a new proposal has been made so as
to make the recharging of the mobile phones is done automatically as you talk
in your mobile phone. This is done by use of microwaves.
The microwave signal
is transmitted from the transmitter along with the message signal using special
kind of antennas called slotted wave guide antenna at a frequency is 2.45 GHz.
There are minimal additions, which have to be made in the mobile handsets,
which are the addition of a sensor, a
Rectenna, and a filter. With the above setup, the need for separate chargers
for mobile phones is eliminated and makes charging universal. Thus the more you
talk, the more is your mobile phone charged. With this proposal the
manufacturers would be able to remove the talk time and battery stand by from
their phone specifications.
THE ELECTROMAGNETIC
SPECTRUM- To start with, to know what a spectrum is: when white light is shone
through a prism it is separated out into all the colors of the rainbow; this is
the visible spectrum. So white light is a mixture of all colors. Black is not a
color; it is what you get when all the light is taken away. Some physicists pretend that light consists
of tiny particles which they call photons. They travel at the speed of light
(what a surprise). The speed of light is about 300,000,000 meters per second.
When they hit something they might bounce off, go right through or get
absorbed. What happens depends a bit on how much energy they have. If they
bounce off something and then go into your eye you will "see" the
thing they have bounced off. Some things like glass and Perspex will let them
go through; these materials are transparent. Black objects absorb the photons
so you should not be able to see black things: you will have to think about
this one. These poor old physicists get a little bit confused when they try to
explain why some photons go through a leaf, some are reflected, and some are
absorbed. They say that it is because they have different amounts of energy.
Other physicists pretend that light is made of waves.
These physicists measure
the length of the waves and this helps them to explain what happens when light
hits leaves. The light with the longest wavelength (red) is absorbed by the green
stuff (chlorophyll) in the leaves. So is the light with the shortest wavelength
(blue). In between these two colors there is green light, this is allowed to
pass right through or is reflected. (Indigo and violet have shorter wavelengths
than blue light.)
Well it is easy to
explain some of the properties of light by pretending that it is made of tiny
particles called photons and it is easy to explain other properties of light by
pretending that it is some kind of wave. The visible spectrum is just one small
part of the electromagnetic spectrum. These electromagnetic waves are made up
of to two parts. The first part is an electric field. The second part is a
magnetic field. So that is why they are called electromagnetic waves. The two
fields are at right angles to each other.
Thus this paper
successfully demonstrates a novel method of using the power of the microwave to
charge the mobile phones without the use of wired chargers. Thus this method
provides great advantage to the mobile phone users to carry their phones anywhere even
if the place is devoid of facilities for charging. A novel use of the rectenna
and a sensor in a mobile phone could provide a new dimension in the revelation
of mobile phone.
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