1. WIRELESS CHARGING OF MOBILEPHONES USING MICROWAVES

2. CONTENTS
 NEED OF W.C.
 LIGHT & MICROWAVES
 THE MICROWAVE REGION
 TRANSMITTER DESIGN
 RECEIVER DESIGN
 RECTENNA
 PROCESS OF RECTIFICATION
 SENSOR
 ADVANTAGES
 DISADVANTAGES
 CONCLUSION
 REFERENCES

3. NEED OF WIRELESS CHARGING
 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.
 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.

4. What Is Wireless Charging…?
 Wire+Less
How It Is Done……?
 Using Micro Waves

5. Why Microwaves…???
 Because These Can Penetrate
Haze
Rain and Snow
Clouds
Smoke
Frequency Selection…!
 S Band Of Spectrum (ISM)

6. LIGHT &Microwaves
 Photons
 Wavelength Of Light
 EM waves

7. THE ELECTROMAGNETIC SPECTRUM

9. THE MICROWAVE REGION
 Here we have selected the license free 2.45 GHz ISM band
for our purpose

11. Transmitter And Receiver

12. TRANSMITTER
 The MAGNETRON is a self-contained microwave
oscillator that operates differently from the linear-beam
tubes, such as the TWT and the klystron.
Electron beam
Energy
Microwave
Energy
Cross Field Device

13. Magnetron

14. THE SLOTTED WAVEGUIDE ANTENNA
Impedance Matching
Transmission

15. Receiver
 Rectenna:-
Microwave
DC Energy
Energy

16. RECTENNA
 Schottky Barrier Diode
 Low Pass Filter

17. Why Schottky Diode….???
 Small Voltage Drop
 Higher Switching Speed
 Low Noise Index

18. SENSOR
F V
 Detection of Message Signal
 Triggering The Rectenna
 GSM Frequency In INDIA (900MHz Or 1800MHz)

19. Schottky Diode
 A Schottky barrier diode is formed by connecting a
metal with a semiconductor.
 The semiconductor material of metal generally is chosen
from different metals such as molybdenum, chromium,
platinum and tungsten.
 This diode does not has minority carriers, its speed is
much faster, so its reverse recovery time(Trr) is very
short and shorter than 10 ns.

20. Advantages
 The need of different types of chargers by different
manufacturers is totally eliminated
 Lower risk of ELECTRICAL SHOCK or shorting.
 Convenience
 Wireless energy transfer can potentially recharge the
mobile phones without chords

21. Disadvantages
 The transmitter and receiver also should be very
powerful devices as the distance increases.
 Slower Charging.
 Wireless transmission of the energy causes some drastic
effects to human body, because of its radiation.
 More costly.
 Practical possibilities are not yet applicable as there is
no much advancement in this field.

22. CONCLUSION
 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.
 A novel use of the rectenna and a sensor in a mobile
phone could provide a new dimension in the revelation
of mobile phone.