Wireless Communication:Statement: Wireless communication, as the term implies, allows informationtobeexchangedbetweentwodeviceswithoutthe use of wire or cable.ContInformationisbeingtransmittedandreceivedusing electromagneticenergy,alsoreferredtoaselectromagnetic radiation.Oneofthemostfamiliarsourcesofelectromagneticradiation istheairmediaothercommonsourcesincludeTVandradio signals, light bulbs and microwavesWire less communication system:STATEMENT:

Radiofrequency(RFisafre!uencyorrateof oscillation within the range of about " #$ to "%% $. What is the need for rf?Thisrangecorrespondstofre!uencyofalternatingcurrent electrical signals used to produce and detect radio waves. 'ince most of this range is beyond the ibration ratethat mostmechanicalsystemscanrespondto,()usuallyrefers tooscillationsinelectricalcircuitsorelectromagnetic radiation!R"!ERT#ES "F RF: Theeasewithwhichitcanioni$eairtocreatea conductive path through air. *n electromagnetic force that drives the () current to the surface of conductors, +nown as the s+in effect. Theabilitytoappeartoflowthroughpathsthat containinsulatingmaterial,li+ethedielectric insulator of a capacitor. $#FFERENTRAN%ES!RESENT#NRF:W&AT ARE T&E MA#N RE'(#REMENTS F"R T&E )"MM(N#)AT#"N (S#N% RF? () Transmitter () (eceiver ,ncoder and -ecoderRF TRANSM#TTER AN$ RE)E#*ER:!#N $#A%RAM:!#N $ES)R#!T#"N:!in No Function Name+ &round (%V &round, 'erial data input pin -ata- 'upply voltage. /V Vcc. *ntenna output pin *0T!in No Function Name+ &round (%V &round, 'erial data output pin -ata- 1inear output pin. not connected02. 'upply voltage. /V Vcc/ 'upply voltage. /V Vcc0 &round (%V &round1 &round (%V &round2 *ntenna input pin *0TRF TRANSM#TTER: RF RE)E#*ER:Transmission )ircuit:M"$(3AT#"N:Rece4tion circuit:$EM"$(3AT#"N:W&5$"WE%"F"RRF)"MM(N#)AT#"N?RF Advantages:No line of sight is needed.Not blocked by common materials , It can penetrate most solids and pass through. RF Disadvantages:Interference:communicationdevicesusingsimilar frequencies-wirelessphones,scanners,wristradios and personal locators can interfere with transmission Lackofsecurity:easiertoeavesdropon transmissionssincesignalsarespreadoutinspace rather than con!ned to a wire "igher cost than infrared #ederalCommunicationsCommission$#CC%licenses required for some products Lowerspeed:dataratetransmissionislowerthan wired and infrared transmission&C' to - (segment