Antennas are classified according to their directionality and can be divided into () antennas and () antennas. (Multiple choice)

Question

Options

• APlate shape
• BParaboloid
• Comnidirectional
• DOrientation

• A
  6% (2)
• B
  12% (4)
• C
  82% (28)

Explanation

Antennas classified by directionality fall into exactly two complementary categories: omnidirectional (C) and directional/orientation (D). Omnidirectional antennas radiate and receive signals equally in all directions (360°), while directional antennas focus energy toward a specific direction, improving range and reducing interference in that direction.

Why A and B are wrong: "Plate shape" and "Paraboloid" describe the physical geometry of an antenna, not its directional behavior. A parabolic dish happens to be directional, but shape is a structural classification, not a directionality classification - the question specifically asks about directionality.

Memory tip: Think of the word pair as opposites - omni (Latin for "all") vs. oriented (pointed somewhere). If a classification system splits antennas by directionality, it must have exactly these two poles: "points everywhere" vs. "points somewhere." Any answer describing a physical shape (plate, paraboloid) is answering a different question entirely.

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