WIRELESS CHARGING INTRODUCTION  Always the recharging of mobile phone batteries has always been a problem for us.  This problem will be solved after our proposal………!!!!!!!!  In this paper a new proposal has been made so as to make the recharging of the mobile phones is done automatically as you talk in your mobile phone! 3.  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  Thus the more you talk, the more is your mobile phone charged!!!!!!! This is new isn’t?!! 4. What Is Microwaves?????  Microwaves are good for transmitting information from one place to another because 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 5. Microwaves > Frequency Range: 3GHZ to 300GHZ > Remort Sensing. > Communication Industry. >2.45GHZ ISM Band. 6. TRANSMITTER DESIGN  The MAGNETRON is a self-contained microwave oscillator that operates differently from the linearbeam tubes, such as the TWT and the klystron.  ——Magnetron is used to produce high-power output required in radar and communications equipment  —Microwaves used in mobile communication are also produced by similar Oscillators 7. Magnetron - Construction 8. PRINCIPLE OF OPERATION 9. WHAT’S RECTANNAE??? What’s rectannae you are confused…….it’s nothing but the combination of rectifier and antenna. Antenna is to receive the microwave signal and it just feed the signal to rectifier . Rectifier is to convert the AC signal to PULSATING DC signal. 10. RECEIVER DESIGN  The basic addition to the mobile phone is going to be the rectenna.  A rectenna is a rectifying antenna, a special type of antenna that is used to directly convert microwave energy into DC electricity. 11. ADVANTAGES  Use of separate chargers is eliminated.  Electricity is saved  The phone can be charged anywhere anytime.  Wireless energy transfer can potentially recharge the mobile phones without chords.  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. 12. DISADVANTAGES  The transmitter and receiver also should be very powerful devices as the distance increases.  Slower Charging.  Wireless transmission of the energy causes some drastic effects to human body, because of its radiation.  More costly.

1. BY,
RavI KUMAR
S7 , EC
110600102023
slset 1

2.  INTRODUCTION
 WHATS HAPPENING
 MICROWAVE REGION
 FREQUENCY SELECTION
 BLOCK DIAGRAM
 TRANSMITTER SECTION
 RECEIVER SECTION
 ADVANTAGES
 DISADVANTAGES
 APPLICATION
 CONCLUSION
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3.  Mobile phones becoming basic part of our life
 Recharging of mobile phones is a big problem
 Achieved by recharging battery while talking using
microwaves
 More you talk more the mobile get charged!
 No separate mobile charger
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4.  Microwave signal is transmitted from transmitter along
with message signal using slotted waveguide antenna at
frequency 2.45 GHz
 Charging made universal
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5. Wavelength : 1 mm-30 cm
 Microwave can be used for:
1. Measuring body temperature
2. Transmitting information
3. RADAR
4. Communication
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6. We choose s –band of microwave region(2-4GHz)
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Designation Frequency range
L Band 1 to 2 GHz
S Band 2 to 4 GHz
C Band 4 to 8 GHz
X Band 8 to 12 GHz
Ku Band 12 to 18 GHz
K Band 18 to 26 GHz
Ka Band 26 to 40 GHz
Q Band 30 to 50 GHz
U Band 40 to 60 GHz

7.  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
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8. 8

9. Consists of two parts
Magnetron
Slotted waveguide antenna
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10. • Magnetron is a vacuum tube oscillator that generates
high-power electromagnetic signals in the microwave
frequency range.
• Generates high-power electromagnetic signals in
the microwave frequency range.
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11.  It is an Omni-directional antenna
 Has high efficiency and gain of 13dB
 Here we use frequency of 2.45GHz
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12.  Basic additions to mobile phone
a. Sensor
b. Rectenna
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13.  Simple circuit which detects whether the user is making
a call
 Simple F to V 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 F to V converters would act as a switches to
trigger the rectenna circuit is on
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14.  What is Rectenna ?
 Rectenna = Rectifier + Antenna.
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15.  Rectenna is a rectifying circuit that converts microwave
energy into DC output.
 Very thin as sheets and can be used at the back of the Cell
phones
 In our design it consists of a single diode power rectifier
in “hybrid technology” with improved sensitivity at low
power levels.
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16.  Saving time for charging
 Wastage of power is less
 Better than witricity
 Get charged as we make call during long journey
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17.  Radiation problems may occur
 Network traffic may cause problems in charging
 Charging depends on network coverage
 Rate of charging may be of minute range
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18. As the topic’s name itself it is used for
“ WIRELESS CHARGING OF MOBILE PHONES”
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19.  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.
 Use of rectenna and sensor in mobile phone could
provide new dimension in the revolution of MOBILE
POWER
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