in this paper a new propasal has been made so as to make the recharging of mobile phones is done automatically as you talk in your mobile phone.this is done by use of microwaves.

1. WIRELESS CHARGING OF MOBILE
PHONES USING MICROWAVES
PRESENTED BY:
L.KAVYA,
Y.MADHAVI.
SRI VAHINI INSTITUTE OF SCIENCE AND TECHNOLOGY

2. CONTENTS•
• INTRODUCTION
• MICRO WAVEREGION
• TRANSMITTER DESIGN
• RECEIVER DESIGN
•BLOCK DIAGRAM
•PROCESS OF RECTIFICATION
• ADVANTAGES
• DISADVANTAGES
• APPLICATIONS
• FUTURESCOPE
• CONCLUSION

3. INTRODUCTION
• 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.

4. THE MICROWAVE REGION
• The micro wave region in electromagnetic spectrum ranges form 0.3cm to
300cm
• It’s wave length approximately from 1mm to 30cm
• In this microwave region we use s- band frequency range(2GHZ-4GHZ)

5. TRANSMITTER SECTION
Transmitter sections consists of mainly two parts they are
• Magnetron
• Slotted wave guide
MAGNETRON:
 It is a self-contained micro wave oscillator that operates at different
frequencies from linear oscillator
 Cross field and magnetic fields are used to produce high-power output

6. SLOTTED WAVE GUIDE:
It is very low loss transmission line, it allows propagation signals
to a number of antennas .
The signal is coupled in to the wave guide with a simple co-axial
probe, and it travels along the guide it transverse the slots
it transmits it’s energy using horizontal polarization the best
type for distance transmission

7. RECEIVER SECTION
The receiving section consists of a two parts they are
• Sensor circuit
• Rectenna
SENSOR CIRCUIT:
• It is a simple circuit which detects whether the
• user is making a call
• The sensor circuit directs rectenna circuit to on
• A simple and powerful F-V converter is LM2907
• Would serves our purpose
• In India the operating frequency of mobile phones is 900MHZ-1800MHZ
for the GPS mobile systems

8. RECTENNA
• The basic addition to the mobile phone is going to
the rectenna .
• A rectifying antenna called a rectenna .it is receives
the transmitted power and converts the microwave
power to direct current (DC) power.
• It is constructed by a schottky diode
• The diode rectifies the current induced in the
antenna by the microwaves
• Life time of rectenna is very long and it doesn’t
have a replacement

9. BLOCK DIAGRAM

10. THE PROCESS OF RECTIFICATION
• Microwave energy transmitted from space to
earth apparently have the potential to provide
clean electrical power on a very large scale.
• The aim of the study to make a low cost power
rectifier for low & high power levels
at a frequency of 2.45GHz.
• The schottky diode microwave rectifying circuit
has the efficiency is greater than 90%.


11. ADVANTAGES
• Use of separate chargers is eliminated.
• Electricity is saved.
• The phone can be charged anywhere anytime.
• Wireless energy transfer can potentially recharge the mobile
phones without chords.
• Only one microwave transmitter can serve to all the service
providers in that area.
• The need of different types of chargers by different manufacturers
is totally eliminated.

12. DISADVANTAGES
• Radiation problems may occur
• Net work traffic may cause problem in charging
• Charging depends on network coverage
• We should use a power full transmitter and receiver

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

15. 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.
• 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.

16. QUERIES….??