Question
What type of antenna pattern is shown in Figure E9-2?
Answer Options
- A) Elevation
- B) Azimuth
- C) Near field
- D) Polarization
Correct Answer: A
Explanation
Antenna radiation patterns are generally plotted in two orthogonal (perpendicular) planes to fully characterize the antenna’s radiation over a sphere. The two standard cuts are the horizontal plane and the vertical plane.
Figure E9-2 plots the antenna’s gain (in dBi) against the vertical angle from the horizon (or ground level, 0°) up to 90°. This graph shows how the signal radiates at different vertical angles. Therefore, Figure E9-2 shows an Elevation pattern (or vertical radiation pattern), which is critical for predicting HF skip propagation and VHF long-distance work.
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