Question
Which of the following best describes the radiation pattern of a quarter-wave ground-plane vertical antenna?
Answer Options
- A) Bi-directional in azimuth
- B) Isotropic
- C) Hemispherical
- D) Omnidirectional in azimuth
Correct Answer: D
Explanation
A quarter-wave ground-plane vertical antenna consists of a vertical radiating element and a horizontal ground plane (or set of radials). The electromagnetic wave radiates perpendicularly to the direction of current flow. Since the current flows vertically, the signal radiates horizontally.
Because the antenna geometry is symmetrical in the horizontal plane, the radiation is equally distributed in all directions around the antenna. Therefore, its pattern is best described as omnidirectional in azimuth, meaning it radiates equally well in a 360^\circ circle.
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