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Antennas & Propagation

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.

Types of Antennas Isotropic antenna (idealized) oRadiates power equally in all directions Dipole antennas oHalf-wave dipole antenna (or Hertz antenna) oQuarter-wave vertical antenna (or Marconi antenna) Parabolic Reflective Antenna oUsed for terrestrial microwave and satellite applications oLarger the diameter, the more tightly directional is the

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