20-09-2016, 03:21 PM
1455432260-755370405sobh.docx (Size: 497.74 KB / Downloads: 6)
ABSTRACT
Mobile Phones are part of our life. It is the fastest and the easiest medium of communication. Battery life of mobile phone is always been a problem for manufacturers. People are complaining about their mobile’s battery life, that they don’t have long battery life and they have to charge their phone several times. In this paper a new idea is shown to charge your mobile phone anywhere you want without connecting its charger. This is done using microwaves. Microwaves are the radio waves which provide communication between two mobile phones. The microwave is sent with the message by the transmitter using antenna at the frequency of 2.45GHz. Here we are using Microwaves as the source of energy to charge the phone. We have to add a sensor, a rectenna circuit and a filer in our mobile phone to do the job. By adding these things we can charge our phone using microwave when we talk. So as we talk more we can charge more!!
Microwave Region
Microwaves are the Radio wave which has the wave length range of 1 cm to 1 meter. And the frequency is 300MHz to
300GHz.Each and every object on the earth absorb different amount of microwave energy. Microwave oven converts this microwave energy in to the frequency which the food absorbs and gets energy from it and get worm. But the bowl containing the food do not get worm because its capacity of absorbing microwave frequency is different! Microwaves are good at carrying information from one place to other. As the microwave penetrates the solid material and also it do not have and effect of weather and rain etc. So it is useful to carry information.
3. DESIGN
3.1 Transmitter design
A magnetron is a diode vacuum tube.
Filament in the tube act as the cathode. Magnetron is actually act as a oscillator to produce microwaves. It can be done by putting magnet between the resonating chambers which is the center of the oscillator. These resonating chambers are called the anode of the magnetron. When electrons come out from the cathode it direct towards the Anode. As it pass through the magnetic field it start circulating in the resonating cavity and start producing waves according to its frequency. And the generated RF signal flow outside of the chamber.
3.2 Receiver design
We have to add a sensor and a Recteen at the receiver side. As we have seen that recteena actually convert the Microwave in to the DC power. Rectenna are very powerful to convert the Microwave in to the electricity. Actually the size of rectenna can be reduce using the Nano technology. Another important part is the Sensor. As we know we are going to charge the phone while a person is talking. So here sensor is used to detect wither the phone is using microwaves or not.
3.3 The Process of Rectification
Microwave can travel through the media but it also lose some energy. So our key objective is to rectify the circuit our objective is to rectify the waves at the low cost. And also we have to make the detection more sensitive. As we know that bridge rectification is more efficient than the single diode. And we use the shotky diode to get the batter impedance.
3.4 Sensor Circuitry
The sensor circuit is used to find whether the mobile phone using the microwaves for message transferring or not! So here we can use any Frequency to Voltage converter to do our job. Here in India the operating frequency of the GSM is 900 MHz to 1800
MHz. We can use LM2907 for F to V conversion. It actually acts as a switch to trigger out rectenna circuit on or off. So when our phone is receiving microwave signal it make the recteen circuit on and charge the battery.
4. CONCLUSION
So here it is shown that a mobile phone can be charge using the microwave which we get everywhere where a mobile phone can perform its task.