this paper is about wireless charging of mobile phones using microwaves

1. WIRELESS CHARGING OF MOBILE PHONES USING
MICROWAVES
PRESENTED BY
PREETHI RADHA KRISHNAN

2. CONTENTS
INTRODUCTION
OBJECTIVE
OUTLINE
PRINCIPLE OF OPERATION
TRANSMITTER
RECEIVER
IMPLEMENTATION
ADVANTAGES
DISADVANTAGES
FUTURE SCOPE
CONCLUSION

3. INTRODUCTION
A new proposal has made recharging of the mobile phones is done
automatically as you talk in your mobile phone!
The recharging of the mobile phones is independent of their
manufacturing and battery make.
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 2.45GHz.

4. OBJECTIVE
The main objective of this current proposal is to make the recharging
of Mobile phones independent of their manufacturer and battery.
We are going to add just a rectenna & a filter to the ordinary mobiles
during manufacturing time…
Thus the more you talk, the more is your mobile phones charged!!!
This is new isn’t?!!

5. ELECTROMAGNETIC SPECTRUM

6. MICROWAVE REGION
Microwave wavelength range approximately from 1mm(thickness of
pencil lead) to 30cm(about 12 inches).
The microwave region in electromagnetic spectrum ranges from 0.3cm to
300cm.
Microwave region give the information about the temperature of the
object that emitted microwaves.

8. PRINCIPLE OF OPERATION
The microwave signal is transmitted along with message signal using
slotted wave guide antenna.
The sensor search for the mobile signal, in addition it has a
“RECTENNA”.
Rectenna receives the transmitted power and converts the
microwave power to DC power.

9. TRANSMITTER DESIGN
It is a self-contained microwave oscillator that operates different from
linear oscillator.
Cross field and magnetic field are used to produce high-power output.

10. RECEIVER DESIGN
The basic addition to a mobile phones is to be rectenna.
Its elements are usually arranged in a mesh pattern.
A simple rectenna is constructed by using a schottky diode.

11. RECTENNA
It is nothing but the combination of rectifier and antenna.
Antenna is to receive the microwave signal and it just feed the signal
to receiver.
Rectifier is to convert the microwave energy to electricity.

12. IMPLEMENTATION
Recently NOKIA has launched this wireless charging technology in its
new recent mobile model “NOKIA LUMIA 1020”.
Energy efficient charges of all size and shape to match our phone.
They are all quiet compactable, which means we can use any charges
we like.

13. ADVANTAGES
One can carry their mobile phones any place even to a remote village.
The use of wired chargers are eliminated.
The phone can be charged at any place and any time.
Electricity can be saved.
The more you talk the more you get charged.

14. DISADVANTAGES
Radiation problem may occur.
Network traffic may cause problem in charging.
Rate of charging is of minute range.
Charging depends on network coverage.

15. FUTURE SCOPE
In future RECTENNA is used to produce large-scale power from
microwaves beam.
This technology is also applicable for electronic gadgets which work
on batteries and thus saves electricity.
Currently researches are going on, to implement this technology for
laptops.

16. CONCLUSION
A novel use of RECTENNA and a SENSOR in mobile phone could
provide a new dimension in the revelation of mobile phones.
Thus a great advantages is to carry their mobile phones to any place
is devoid of facilities for charging.

17. ANY QUERIES?

18. THANK YOU