This document proposes a wireless mobile charging system using microwaves. It would allow phones to charge automatically as users talk, eliminating the need for physical charging cables. The system would consist of a transmitter using a magnetron and slotted waveguide antenna to broadcast microwaves. Receivers on phones would contain a sensor and rectenna to detect and convert the wireless energy into electricity to charge the battery. While this could provide more convenient charging anywhere, concerns include potential health effects of radiation exposure and higher system costs compared to wired charging.

1. Wireless Mobile
Charging
Using Microwaves

2. Introduction
 Mobile phones becoming a basic part of life, the recharging of mobile phone
batteries has always been a problem.
 The main objective of this current proposal is to make the recharging of the
mobile phones independent of their manufacturer and battery make.
 recharging of the mobile phones is done automatically as you talk in your
mobile phone! This is done by use of microwaves.

3. Electro Magnetic Spectrum
 Spectrum: The range of wavelengths or frequencies over which
electromagnetic radiation extends.

4. Worlds Most Common Frequency Band

5. Microwaves
 Microwaves are a form of electromagnetic radiation with wavelengths
ranging from as long as one meter to as short as one millimeter; with
frequencies between 300 MHz (100 cm) and 300 GHz (0.1 cm).
 Generally used for Telecommunication etc.

6. Working of Model

7. Parts
 Transmitter
 RF Cable
 Slotted Wave Guide Antenna
 Sensor
 Receiver( Rectenna)

8. Transmitter Section
Transmitter section consist of two parts, They are:
1. Magnetron,
2. Slotted Waveguide antenna.

9. Magnetron
 High power microwave
oscillator
 Special kind of vacuum
tube
 Efficiency 50 to 80 %
 Uses CROSSED-ELECTRON
& MAGNETIC fields

10. Slotted Wave Guided Antenna
 Slotted Wave guided Antenna is
used as an omni-directional role.
 Is an Horizontally Polarized
Antenna Type.
 Is a very low loss transmission line.

11. RF Cable
 Designed to work at
RF (multi megahertz range).
 High data rate wireless transceivers

12. Reciever Section
Receiver section consist of 3 parts, they are:
1. Sensor,
2. Rectenna

13. Sensor Circuitry
 Microwave sensors
 The circuitry consist of F to V convertor.
 LM 2907 is used for this conversion.

14. Rectenna
 Invented by William c . Brown in 1964
 Dipole antenna with RF diode
 In laboratory environments, efficiencies
above 90% have been observed with
regularity.

15. Advantages
 Charging of phone is done wirelessly.
 We can saving time for charging mobiles.
 Wastage of power is less.
 Only one microwave transmitter can
serve to many devices for charging.
 Different type of chargers are
eliminated.

16. Disadvantages
 Wireless transmission of the energy causes some effects to human body,
because of its radiation.
 Charging depends on network coverage.
 Network traffic may cause problems in charging.
 Process is of high cost.

17. Conclusion
 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.
“Time is really the only capital that any human being has, and
the only thing he cant afford to lose”

18. Thank
you