ABSTRACT

Mobile phones becoming a basic part of life, the recharging of mobile phone batteries

have always been a problem. The mobile phones vary in their talk time and battery

standby according to their manufacture and batteries. All these phones irrespective of

their manufacturer and batteries have to be put to recharge after the battery has drained

out. The main objective of this current proposal to make their charging of the mobile

phones independent of their manufacturer and battery make. 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. This done by using microwaves.

The microwave signal is transmitted from the transmitter along with the message

signal using special kind of antennas called slotted waveguide antenna at a frequency is

2.45GHZ. There are minimal additions, which have to be made in the mobile handsets,

which are the addition of a sensor, a rectenna and a filter. With the above setup, the need

for separate chargers for mobile phones is eliminated and makes charging universal. Thus

the more you talk, the more is your mobile phone charge. With this proposal the

manufacturers would be able to remove the talk time and battery standby from their

phone specifications.

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CONTENTS

Title Page no.

Abstract i

Table of contents ii

List of figures iii

List of tables iv

1. Introduction 12. Electromagnetic Spectrum 2 2.1 Microwave Region 3 2.2 Frequency Selection 43. Wireless Power Transmission 5 3.1 Microwave Generator 6 3.2 Transmitting Antenna 64. Block Diagram 75. System Design 7 6. Transmitter Design 7 6.1 Magnetron and its Working 8 6.2 Slotted Waveguide Antenna 97. Receiver Design 9 7.1 Rectifying Antenna 10 7.2 Schottky Barrier Diode 118. Sensor Circuitry 129. Future Scope 1310. Advantages 1311. Disadvantages 1312. Conclusion 14 13. References 15

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LIST OF FIGURES

Fig. no. Title name Page no.

2.1 Electromagnetic spectrum 3

2.2 Microwave Region 4

3.1 Power Transmission System Block Diagram 6

6.1 Magnetron 8

6.2 Resonant cavity magnetron oscillator 8

6.3 Slotted Waveguide Antenna 7

6.4 Waveguide 9

7.1 Rectenna 10

7.2 Rectenna circuitry 11

6.1 Sensor (LM2907) 12

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LIST OF TABLES

Table no. Title name Page no.

2.1 Frequency Ranges 5

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