Which of the following belongs to the category of directional antennas? (Multiple choice)

Question

Options

• AOff-board cross-polarized antenna
• BPanel directional antenna
• CPanel Omnidirectional Antenna
• DPlate type cross-polarized antenna

• A
  73% (32)
• C
  27% (12)

Explanation

Options A, B, and D are all directional antennas because they concentrate radiated energy in a specific direction or sector rather than broadcasting equally in all directions. Panel directional antennas (B) are named for this property outright, while off-board cross-polarized (A) and plate-type cross-polarized (D) antennas are physically structured to focus their beam pattern directionally - cross-polarized designs are commonly deployed in sector-based cellular base stations precisely because of their directional gain. Option C is the distractor: despite also being a panel form factor, the word "Omnidirectional" means it radiates equally in all horizontal directions (360°), which is the defining characteristic of the opposite category.

Memory tip: Lock onto the word "omni" - from Latin omnis meaning "all." Any antenna labeled omnidirectional covers all directions and is immediately excluded from the directional category, regardless of its physical shape.

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