1. Mobile Phone Charging Using
Microwaves
BY
m.NAVEEN KUMAR
M.Tech_vlsi
13241d5710
griet
1

2. Contents
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•
•
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Introduction
Transmitter design
Receiver design
Advantages
Disadvantages
Conclusion
References

3. Introduction
The electromagnetic spectrum:
 What is EM spectrum?
 How EM spectrum is produced?
 Example…
Microwave region:
 What is Microwave region?
 Why we go for Microwave communication?
 Selection of frequency…

4. The electromagnetic spectrum
 What is EM spectrum?

5. The electromagnetic spectrum
 How EM spectrum is produced?

6. The electromagnetic spectrum
 Example

7. What is Microwave region
Wavelength : 1 mm-30 cm

8. Why we go for Microwave communication?
 Microwaves are good for transmitting information
from one place to another ( because it penetrate haze ,
light rain , snow , clouds etc…).

9. Selection of frequency
 The frequency selection is another important aspect in
transmission. Here we have selected the license free
2.45 GHz(Industrial, Scientific and Medical) ISM
band for this purpose.

10. Block diagram
Slotted waveguide
Antenna
mobile signal
circulator
Transmitting station
with the microwave
transmitter
sensor
RF cable
Rectenna
waveguide

11. Magnetron

12. Slotted waveguide antenna

13. sensor circuit
VOUT = fIN
VCC
Zener regulated frequency to voltage converter
Rx
Cx

14. Rectenna block diagram

15. rectenna

16. Rectenna array

17. Advantages
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.
Mobile get charged as we make call even
during long journey.

18. Disadvantages
Wireless transmission of the energy causes
some drastic effects to human body, because of
its radiation
Practical possibilities are not yet applicable as
there is no much advancement in this field.
Process is of high cost

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

20. References
Theodore.S.Rappaport , “Wireless Communications
Principles and Practice”.
Tae-Whan yoo and Kai Chang, "Theoretical and
Experimental Development of 10 and 35GHz
rectennas" IEEE Transaction on microwave Theory
and Techniques, vol. 40.NO.6.June.1992.
'Microwave and RF circuits: analysis,synthesis, and
design', Artech House, Norwood, MA,1993.

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