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Subelement E
Antenna Systems
Section 39
Antenna Systems
Slotted waveguide arrays, when fed from one end exhibit:
  • Correct Answer
    Frequency scan.
  • High VSWR.
  • Poor performance in rain.
  • A narrow elevation beam.
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A typical shipboard RADAR antenna is a:
  • Rotary parabolic transducer.
  • Correct Answer
    Slotted waveguide array.
  • Phased planar array.
  • Dipole.
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Good bearing resolution largely depends upon:
  • A high transmitter output reading.
  • A high duty cycle.
  • A narrow antenna beam in the vertical plane.
  • Correct Answer
    A narrow antenna beam in the horizontal plane.
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The center of the transmitted lobe from a slotted waveguide array is:
  • Correct Answer
    Several degrees offset from a line perpendicular to the antenna.
  • Perpendicular to the antenna.
  • Maximum at the right hand end.
  • Maximum at the left hand end.
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How does antenna length affect the horizontal beamwidth of the transmitted signal?
  • The longer the antenna the wider the horizontal beamwidth.
  • Correct Answer
    The longer the antenna the narrower the horizontal beamwidth.
  • The horizontal beamwidth is not affected by the antenna length.
  • None of the above.
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What is the most common type of RADAR antenna used aboard commercial maritime vessels?
  • Parabolic.
  • Truncated parabolic.
  • Correct Answer
    Slotted waveguide array.
  • Multi-element Yagi array.
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