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microwaves by peer aakif

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microwaves

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microwaves by peer aakif

  1. 1. Teacher : Dr. Rafi Ahmad Khan WIRELESS MEDIUM TECHNOLOGIES microwaves Bluetooth PRESENTATION BY : PEER AAKIF ROLL NO: 27 Vsat Peer aakif
  2. 2. • WIRELESS MEDIA IS OFTEN REFERRED TO AS UNBOUNDED MEDIA WHICH MEANS PATH FOR NETWORK TRANSMISSIONS IS UNRESTRICTED. WHEN COPPER CORE OR FIBER-OPTIC CABLE IS USED, THE TRANSMITTED NETWORK SIGNALS ARE BOUND TO THE MEDIUM. WHEN THE ATMOSPHERE IS USED, THE TRANSMISSION IS SPREAD THROUGHOUT THE ATMOSPHERE AND IS NOT LIMITED TO A SINGLE PATH. Peer
  3. 3. WHAT ARE MICROWAVES • MICROWAVES ARE A FORM OF ELECTROMAGNETIC RADIATION WITH WAVELENGTHS RANGING FROM A FEW CENTIMETRES TO A FEW MILLIMETRES, OR EQUIVALENTLY, WITH FREQUENCIES BETWEEN 300 MHZ (0.3 GHZ) AND 300 GHZ. THEY ARE USED IN COMMUNICATION COZ OF THEIR LONG WAVE LENGTH AND LOW FREQUENCY SO THAT THEY TRAVEL LONGER DISTANCES
  4. 4. Peer aakif
  5. 5. MICROWAVE COMMUNICATION • . HISTORY : THE TECHNOLOGY USED FOR MICROWAVE COMMUNICATION WAS DEVELOPED IN THE EARLY 1940'S BY WESTERN UNION. THE FIRST MICROWAVE MESSAGE WAS SENT IN 1945 FROM TOWERS LOCATED IN NEW YORK FOLLOWING THIS SUCCESSFUL ATTEMPT, MICROWAVE COMMUNICATION BECAME THE MOST COMMONLY USED DATA TRANSMISSION METHOD FOR TELECOMMUNICATIONS SERVICE PROVIDERS. • MICROWAVE COMMUNICATION IS THE TRANSMISSION OF SIGNALS USING A SERIES OF MICROWAVE TOWERS. MICROWAVE COMMUNICATION IS KNOWN AS A FORM OF "LINE OF SIGHT" COMMUNICATION, BECAUSE THERE MUST BE NOTHING OBSTRUCTING THE TRANSMISSION OF DATA BETWEEN THESE TOWERS FOR SIGNALS TO BE PROPERLY SENT AND RECEIVED • MICROWAVE COMMUNICATION TAKES PLACE IN BOTH ANALOG AND DIGITAL FORMATS. WHILE DIGITAL IS THE MOST ADVANCED Peer aakif FORM OF MICROWAVE COMMUNICATION
  6. 6. WORKING • MICROWAVE TRANSMISSION WORKS ON THE PRINCIPLE OF PRODUCING A CARRIER WAVE AS THE MEANS OF COMMUNICATION BETWEEN TWO WIRELESS DEVICES • CARRIER WAVE IS AN ELECTROMAGNETIC WAVE OF A SET FREQUENCY THAT IS USED TO CARRY • THE CARRIER WAVE IS MIXED WITH THE DATA SIGNAL (MODULATION), THE MIXED WAVE (CARRIER +SIGNAL) IS TRANSMITTED USING A TRANSMITTER . A LARGE NUMBER OF REPEATERS ARE ERECTED AT A NUMBER OF PLACES IN BETWEEN TRANSMITTER AND RECEIVER . • FINALLY THE SIGNAL REACHES THE RECEIVING ANTENNA • THE ANTENNA RECEIVES THE SIGNAL AND SEPARATES CARRIER WAVE FROM DATA SIGNAL TO BE INTERPRETED Peer aakif
  7. 7. ADVANTAGES • MICROWAVE SYSTEMS HAVE THE ADVANTAGE OF 1. NO CABLES ARE NEEDED 2. LARGE BANDWIDTH AVAILABLE 3. MEDIUM COST Peer aakif
  8. 8. DISADVANTAGES ITS DISADVANTAGES ARE 1.RANGE IS LIMITED{ (UPTO 50 KM) DUE TO CURVATURE OF EARTH} 2 .SIGNAL IS ABSORBED BY GROUND DUE TO HIGH FREQUENCY 3. NOISE INTERFERENCE 4. LINE-OF-SIGHT WILL BE DISRUPTED IF ANY OBSTACLE, SUCH AS NEW BUILDINGS, ARE IN THE WAY Peer aakif

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