wireless mobile charging using microwaves

1. Wireless mobile charching
using microwaves
By
Shivani.p
Final year E.C.E

2. CONTENTS
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 INTRODUCTION
 WHAT’S HAPPENING
 MICROWAVE REGION
 FREQUENCY SELECTION
 TRANSMITTER SECTION
 RECEIVER SECTION
 ADVANTAGES
 DISADVANTAGES
 APPLICATION
 CONCLUSION

3. INTRODUCTION
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 Mobile phones becoming basic part of life
 Recharging of mobile phones is a big problem
 Objective—to recharge any mobile phone
independent of manufacturer and battery make
 Achieved by recharging battery while talking using
microwaves

4. WHAT’S HAPPENING?
 Microwave signal is transmitted from
transmitter along with message signal using
slotted waveguide antenna at frequency 2.45
GHz
 Charging made universal
[7]
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5. MICROWAVE REGION
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

Wavelength : 1 mm-30 cm
Microwave can be used for :
1)Measuring body temperature
2)Transmitting information
3) Remote sensing
4) RADAR
5) Communication

6. FREQUENCYSELECTION
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 Select license free 2.45 GHz Industrial,
Scientific and Medical (ISM) radio bands
 ISM bands are reserved internationally for
non-commercial use of RF electromagnetic
fields for industrial, scientific and medical
purpose

7. BLOCKDIAGRAMOFWH
OLESETUP
[8]
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8. TRANSMITTER SECTION
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Consists of two parts
– Magnetron
– Slotted waveguide antenna

9.  Magnetron is a vacuum tube oscillator that
generates high-power electromagnetic
signals in the microwave frequency range.
MAGNETRON [7]
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10. STRUCTURE OF MAGNETRON[8]
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11. SLOTTED WAVEGUIDE
ANTENNA
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 It is an Omni-directional antenna.
 Slotted antenna arrays used with waveguides are
popular antenna in navigation, radar and other
high-frequency systems.
 Has high efficiency and gain of 13dB.
 Here we use frequency of 2.45GHz.

12. Slotted Wave Guide Antenna [5]
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13. RECEIVER SECTION
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Basic additions to mobile phone
Sensor
Rectenna

14. SENSOR CIRCUITRY
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 Simple circuit which detects whether the user is making
a call.
 Simple Frequency to Voltage converter, this would
serve our purpose
 Operating frequency of mobile phone operators for
GSM system for mobile communication in India is
900MHz or 1800MHz
 Simple yet powerful Frequency to Voltage converter is
LM2907

15. RECTIFICATIONRECTENNA
Rectifying Circuit [4]
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16. ADVANTAGES
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 Charging mobiles wirelessly
 Saving time for charging
 Wastage of power is less
 Better than witricity
 Get charged as we make call during long journey.

17. DISADVANTAGES
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 Radiation problems may occur
 Network traffic may cause problems in charging
 Charging depends on network coverage
 Rate of charging may be of minute range

18. APPLICATION
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 As the topic’s name itself it is used for
“ WIRELESS CHARGING OF MOBILE
PHONES”

19. FUTURE
SCOPE
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 Thus this paper successfully demonstrates a novel method of
using the power of microwave to charge mobile phones
without use of wired chargers.
 It provides great advantage to mobile phone users to
carry their phones anywhere even if the place is devoid of
facilities for charging.
 Has effect on human beings similar to that from cell phones
at present.
 Use of rectenna and sensor in mobile phone could provide
new dimension in the revolution of mobile power.

20. CONCLUSION
Thus this technique 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.
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21. REFERENCE
S
[1]. Theodore.S.Rappaport , “Wireless Communications
Principles and Practice”
[2]. Wireless Power Transmission – A Next Generation
Power Transmission System, International Journal of
Computer Applications Volume 1 – No. 13.
[3]. Lander, Cyril W. "2. Rectifying Circuits". Power
electronics London: McGraw-Hill. 3rd edition, 1993.
[4]. Tae-Whan yoo and Kai Chang, "Theoretical and
Experimental Development of 10 and 35 GHz rectennas"
IEEE Transaction on microwave Theory and
Techniques, vol. 40. NO.6. June.1992.
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