This document describes a proposed system for wirelessly charging mobile phones using microwaves. It would work by transmitting microwave signals from an antenna along with message signals. Mobile phones would be equipped with a receiver called a rectenna that converts the microwave energy into direct current to charge the phone battery while the user is talking. The document outlines the system components, advantages like eliminating chargers and allowing charging anywhere, and disadvantages like potential health effects and high costs. It concludes that this novel concept could help charge phones without wires.

2.  INTRODUCTION
 PRINCIPLE OF OPERATION
 TRANSMITTER
 RECEIVER
 IMPLEMENTAION
 ADVANTAGES
 DISADVANTAGES
 CONCLUSION

3.  Always the recharging mobile phone has a
problem for us.
This problem will be solved after our
proposal…..!!!
The recharging of mobile phones is done
automatically as you talk in your mobile.
The microwave signal is transmitted from the
transmitter along with the message signal.

4.  The microwave signal is transmitted along with massage
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 convert
the microwave power to DC.

6.  Microwaves are good for transmitting information from one
place to another.
 microwave energy can penetrate haze, light rain and snow,
clouds, and smoke.
 Shorter microwaves are used in remote sensing.
 These microwaves are used for radar like the Doppler radar
used in weather forecasts .

7.  Frequency range:300MHz-300GHz
 Remote sensing
 Communication industry
 2.45 GHZ, S-Band

8.  The MAGNETRON is a self-contained microwave
oscillator.
 Used to produce high power output in radar and
communication equipment.
 Efficiency of this high power oscillator lies between
50% and 80%.
Electron beam
Energy
Microwave
Energy Cross Field Device

9.  It is used as ideal power transmitter
(because of its high aperture efficiency
>95%) .
 It has high power handling capacity .
 It has 64 slots of power uniformly
through free space to the rectenna.

10. Microwave
Energy
DC Energy
 The basic addition to the mobile
phone is FILTER and RECTENNA.
 RECTENNA is used to convert
microwave energy to DC electricity.

11.  It’s nothing but the combination of Rectifier and
Antenna.
 Antenna receives microwave signal and just feed the
signal to Rectifier.
 Rectifier converts the signal to pulsating DC.

12.  The operating frequency of the mobile phone is 900MHz
or 1800MHz for communication.
 LM2907-a simple n F to V converter used as it operates
between this specified range .
 To trigger the rectenna circuit to ON and the mobile
begins to charge using the microwave power
automatically.
 This is required, as the phone has to be charged as long
as the user is talking.

13.  Recently NOKIA has launched this wireless charging
technology in its new recent mobile model “ NOKIA
LUMIA 1020.

14.  Use of separate chargers are eliminated.
 Electricity is saved.
 The phone can be charged anywhere anytime.
 No risk of electric shock.
 Wireless microwave transmitter can serve to all the
service providers in that area.

15.  Wireless transmission of the energy causes some drastic effects
to human body, because of its radiation.
 Process is of high cost.
 The transmitter and receiver also should be powerful as the
distance increase.

16.  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.

17.  Thus this paper successfully demonstrates a method
of using the power of microwave to charge mobile
phones without use of wired chargers.
 This novel idea minimize the tension of charging your
phone regularly.