Transcription of Antennas & Propagation
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Antennas & PropagationCS 6710 Spring 2010 Rajmohan RajaramanIntroduction An antenna is an electrical conductor orsystem of conductorsoTransmission - radiates electromagnetic energyinto spaceoReception - collects electromagnetic energyfrom space In two-way communication, the sameantenna can be used for transmission andreceptionRadiation Patterns Radiation patternoGraphical representation of radiation properties of anantennaoDepicted as two-dimensional cross section Beam width (or half-power beam width)oMeasure of directivity of antennaoAngle within which power radiated is at least half of thatin most preferred direction Reception patternoReceiving antenna s equivalent to radiation pattern Omnidirectional vs.
oAnalog voice or video oDigital data, digitized voice or video Used to combat intersymbol interference Involves gathering dispersed symbol energy back into its original time interval Techniques oLumped analog circuits oSophisticated digital signal processing algorithms.
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