Dipole Antenna
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Dipole Antenna

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A dipole antenna is the simplest antenna but its radiation characteristics are very good. The main drawback of a dipole antenna is very narrow bandwidth. The analysis of a dipole antenna can be ...

A dipole antenna is the simplest antenna but its radiation characteristics are very good. The main drawback of a dipole antenna is very narrow bandwidth. The analysis of a dipole antenna can be performed with integration of Hertzian dipoles.

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    Dipole Antenna Dipole Antenna Presentation Transcript

    • Antenna Engineering CHO, Yong Heui Dipole Antenna
    • Half-wave dipole antenna 1. Dipole antenna
      • Current approximation
       Balun Coaxial cable Dipole antenna
    • Principle 1. Dipole antenna
    • Electric field
      • Integration of Hertzian dipole
       1. Dipole antenna
    • Far-field vs. Fourier transform
      • Radiation pattern: Fourier transform of source current with respect to wavenumber
       1. Dipole antenna
      • Directivity
      Radiation pattern 1. Dipole antenna 
      • Radiation pattern:
      Dipole antenna with length L 1. Dipole antenna 
      • Antenna length
      • Mainlobe, sidelobe, backlobe, and null
      • Broadside and end-fire antenna
      Radiation pattern 1. Dipole antenna  L = 0.5, 1, 1.5 L = 2, 2.5, 3
      • Radiation resistance
      Radiated power 1. Dipole antenna 
      • Radiation resistance
      Half-wave dipole antenna 1. Dipole antenna  
      • Directivity
      Half-wave dipole antenna 1. Dipole antenna  
      • Inductive loading: input
      • Top loading, L-shaped antenna
      • Pig-tail antenna
      • Narrow bandwidth
        • 10dB return loss or VSWR 2:1
      Characteristics of half-wave dipole 1. Dipole antenna 
      • Coaxial line
      • Quarter-wave dipole with ground
      • Image theorem
      • Sleeve monopole
      Characteristics 2. Monopole antenna 
    • Monopole vs. dipole 2. Monopole antenna 
    • Design of monopole antenna 2. Monopole antenna Courtesy to www.freeuk.com  Monopole Connector Transition
      • Tilted dipole antenna
      • High directivity
      • Easy beam scanning
      Characteristics 3. Vee dipole 
      • Transmission line mode
      • Antenna mode
      Characteristics 4. Folded dipole 
      • : infinity
      • Real input impedance: resonance
      Half-wave folded dipole 4. Folded dipole  
      • Feeding: maximum current
      • Balun (Balanced to Unbalanced)
        • Coaxial cable
        • Sleeve balun (bazooka balun)
      Balun 5. Feeding 
      • Coaxial line to folded dipole
      • Current division and voltage doubling
      • Ferrite core: transformer
      1:4 balun 5. Feeding 
    • Chu limit 6. Antenna limit