Broadband Antenna
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Broadband Antenna

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A broadband antenna means the antenna with wideband radiation characteristics. To make a broadband antenna, we can use a helical, a biconical, a sleeve, a spiral, and a log-periodic antenna.

A broadband antenna means the antenna with wideband radiation characteristics. To make a broadband antenna, we can use a helical, a biconical, a sleeve, a spiral, and a log-periodic antenna.

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Broadband Antenna Presentation Transcript

  • 1. Antenna Engineering CHO, Yong Heui Broadband Antenna
  • 2. Bandwidth 1. Introduction
    • Conventional definition
    • Fractional bandwidth
    • Traveling wave vs. standing wave (resonance)
  • 3. Introduction 2. Helical antenna
    • Helix
    • Operation
      • Normal mode
      • Axial mode
    • Coaxial line feeding
  • 4. Normal mode 2. Helical antenna
    • Small antenna
    • Small loop and ideal dipole
    • CP (Circular Polarization) for certain case
  • 5. Axial mode 2. Helical antenna
    • End-fire antenna
      • The same phase on opposite side of a turn
    • High gain antenna with lots of turns
    • Traveling wave: neglecting ground plane size
  • 6. Introduction 3. Biconical antenna
    • Variation of dipole antenna: thicker wire
    • Input impedance: dipole antenna
      • Real and imaginary
    • Discone (disk-cone) antenna
      • LP (Linear Polarization)
      • Uniform azimuth coverage (omni-directional pattern)
  • 7. Cone type antennas 3. Biconical antenna  
  • 8. Introduction 4. Sleeve antenna
    • Sleeve: transmission and radiation
      • Current on monopole and sleeve monopole
    • Sleeve monopole and dipole
  • 9. Introduction 5. Spiral antenna
    • Frequency independent antenna
    • Self complementary antenna
  • 10. Introduction 5. Log-periodic antenna
    • Periodicity as the logarithm of frequency