ØThe term wireless transmission stands for interchange of power, electricity, data or any other type of information.
ØAccording to the electrical point of view, transmission lines are used for transmitting power supply.
ØBut there is a major risk of electrical hazards like short circuits, power failure, & breakdown of transmission lines.
ØSo, we have suggested an innovative idea to overcome all these electrical hazards.
ØFor this, we have used microwaves.
Øwe are very familiar to microwave ovens.
ØWe have implemented the principle of microwave ovens for our receivers & transmitters.
ØMicrowaves have wavelengths approximately in the range of 30 cams (freq= 1 GHz ) to 1 mm (freq= 300 GHz ).
ØThe term microwaves generally refer to A.C. signals with frequencies between 300 MHz & 300 GHz.
ØThe microwave range includes ultra high frequencies (0.3-3 GHz), super high frequencies (3-30 GHz), & extremely high frequencies (30-300 GHz) signals.
ØWe have used these microwaves for our wireless transmission.

ØHere, the power (electricity) generated at sub-station goes to the transmitter, which works like the principle of microwave oven
ØThis transmitter converts the electricity into microwaves & transmits them to our service towers
ØWhen these transmitted waves reach at the desired tower, (HOME TOWER), the receiver of home tower receives these microwaves & converts them into [IMG]file:///C:/Users/pavan/AppData/Local/Temp/msohtmlclip1/01/clip_image006.gif[/IMG]
Electricity. The electricity is utilized for our home appliances.

ØMICROWAVE POWER TRANSMISION (MPT) method is the use of microwaves to transmit power through outer space or the atmosphere without the need for wires.
ØIn 1964, William C. Brown demonstrated a miniature helicopter equipped with a combination antenna & rectifier called as retina.
ØThe retina converted microwave power into electricity, allowing the helicopter to fly.
ØIn principle, retina is capable for very high conversion efficiencies–over 90% in optimal circumstances.
ØMost proposed MPT systems includes a phased array microwave transmitter.
ØThey have advantage of being electrically steered and easier to scale the necessary levels that a practical MPT system requires.

Wireless switching
Ø Now further we can use the microwaves received by our home tower for wireless switching also
Ø By using wireless switching, we can make the whole transmission wireless....from sub-station to our home appliances.
Ø There is no need of electrical wires to control our electric home appliances like fans, tube lights, washing machines etc…

How wireless switching works?
Øfor wireless switching, we use a TRANSCIEVER, a combo of transmitter & receiver, in our home tower.
ØThis receives & transmits the microwaves directly to the transceiver of our hand held remote control.
ØNow we can control our home appliances by operating this hand-held remote control
ØNow the microwaves transmitted by this remote control are received by the receiver of our home appliance.
ØAnd thus, we can control our home appliances wirelessly.

[IMG]file:///C:/Users/pavan/AppData/Local/Temp/msohtmlclip1/01/clip_image012.gif[/IMG] [IMG]file:///C:/Users/pavan/AppData/Local/Temp/msohtmlclip1/01/clip_image014.gif[/IMG]

ØHere we can use microwaves having frequency of 4 to 8 GHz, which is very well known as the C-band of microwave spectrum.
ØBy using this frequency, the microwaves at our service tower can cover the area of approximately 4 to5 Kms.
ØSo, here we can put our service towers at large distance & we can transmit power with less power loss compare to other transmission methods.
ØAnd microwave have efficiency over 90% as proven by the researches held at Reunion islands, Indian Oceans.