This document discusses wireless power transmission technology for charging mobile phones. It describes the principle of transmitting a microwave signal along with a message signal using a slotted waveguide antenna. The receiver, called a rectenna, receives the transmitted power and converts it to DC power for charging. Implementation in a Nokia phone is mentioned. Advantages include elimination of different chargers, while disadvantages include potential health effects and higher costs. Future applications to power other devices are noted.

1. Submitted to: Submitted by:
Er.Deepesh Namdev Name: Aveen Meena
HOD cum Asso. Prof. Roll no.:10EGKEC011
(E&C, EE Department)
DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGG.
Gurukul Institute of Engineering & Technology, Kota

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

3. Introduction
 The mobile can be charged at any time, anywhere automatically
as you talk in your mobile phone!
This technology would eliminate the need for physically
plugging in an 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. Principle of Operation &
Block Diagram
Transmitting station with
the microwave
transmitter
sensor
Rectenna
RF cable
circulator
waveguide
Slotted waveguide
Antenna
mobile signal
 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.

5. TRANSMITTER
 The MAGNETRON is a self-contained microwave
oscillator.
 Efficiency of this high power oscillator lies between
50% and 80%.
Electron beam
Energy
Microwave
Energy
Cross Field Device

6. Slotted waveguide antenna
 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.

7. Reciever
Rectenna:-
Microwave
Energy
DC Energy

8. 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”.
It comprises of a dipoles and Schottky barrier
diodes Usually its elements are arranged in the
mesh pattern.
Rectenna

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

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

11. Disadvantages
Wireless transmission of the energy causes some
drastic effects to human body, because of its
radiation
Process is of high cost.

12. 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.

13. Conclusion
 Thus this paper successfully demonstrates a
method of using the power of microwave to
charge mobile phones without use of wired
chargers.