Mobile Communications and Antennas - WIUfaculty.wiu.edu/Y-Kim2/TA.pptx · PPT file · Web...
Transcript of Mobile Communications and Antennas - WIUfaculty.wiu.edu/Y-Kim2/TA.pptx · PPT file · Web...
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Mobile Communications and AntennasDescribing and comparing antennas through radiation patterns with home construction techniques
CS 556 Mobile CommunicationsFall 2008Timothy John Adams
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IntroductionAntennas used for mobile
communications and other applications
Basic theory behind antennas and gain
Comparison of antenna gain using radiation pattern graphs
Uses of antennasHomemade antennas
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Basic information for antennasWhat is an antenna
◦Antennas are conductors◦Electric current in the conductor◦Electromagnetic fields◦Radiated power
Isotropic antenna
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Isotropic power
Spherical pattern representing the power radiated from an isotropic antenna
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Antenna GainIsotropic power levelDirected powerHalf-wave dipole antenna powerThe decibelRatio of power is gain
◦Gain of isotropic antenna is 1 or 0 dBi
◦Gain of dipole antenna is 1.64 or 2.15 dBi
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Half-wave dipole
Radiation pattern of a center-fed half-wave dipole antenna
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Omni-directional antennasHalf-wave dipoleQuarter-wave monopoleRadiation pattern characteristics
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Omni-directional radiation pattern in the horizontal plane
Horizontal plan of radiation pattern for half-wave dipole, as if looking down on the antenna from above
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Different elevations but still omni-directional
Half-wave dipole pattern Quarter-wave monopole pattern
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Directional AntennasYagi-UdaHornParabolicHelical
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Yagi-Uda
14 element Yagi-Uda Antenna
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Horn
50 foot horn antenna can pick up weak background radiation from space
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Parabolic
Large parabolic antenna, actually the biggest facility for satellite communication in the world, based in Raisting, Bavaria, Germany.
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Helical
Homemade helical antenna
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Radiation patternsOmni-directionalDirectional
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Directional radiation pattern
Directed gain from a Yagi-Uda antenna
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Directional radiation pattern
More complex pattern from rhombic (wire) antenna
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Coverage area from directional antenna
Coverage area from rhombic (wire) antenna
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Uses of antennasOmni-directional
◦Mobile Receivers◦Base Stations
Directional◦Confined Spaces◦To Prevent Interference
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Homemade AntennasQuarter-wave monopoleQuarter-wave monopole with
waveguide8-segment Coaxial/Collinear
(COCO)
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N-female chassis mounted connector
Basic connector for most homemade antennas
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Quarter-wave monopole antenna with ground plane
Quarter-wave monopole
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Quarter-wave monopole with waveguide
Basic “cantenna”
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Quarter-wave monopole with waveguide and funnel feed
Funnel increases reception capabilities
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8-segment Coaxial/Collinear antenna
Uses basic coaxial cable
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Concluding Remarks