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Antenna & Wave PropagationMonopole Antennas

The approximate directivity of a quarter-wave monopole over an ideal infinite conducting ground plane is?

  • A1 or 0 dBi
  • B1.64 or 2.15 dBi
  • C3.28 or 5.15 dBi
  • D10 or 10 dBi
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Correct Answer: C. 3.28 or 5.15 dBi
Explanation: An ideal quarter-wave monopole radiates into one hemisphere and has about twice the directivity of a half-wave dipole, approximately 3.28 or 5.15 dBi.
Reference: Standard antenna and wave propagation: monopole antennas
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