Refer to the exhibit. Which type of antenna is show on the radiation patterns?

Question

Exhibits

Options

• ADipole
• BYagi
• CPatch
• DOmnidirectional

• A
  88% (21)
• B
  8% (2)
• C
  4% (1)

Explanation

Dipole Antenna Radiation Pattern

A dipole antenna produces a distinctive donut-shaped (toroidal) radiation pattern - appearing as a figure-8 when viewed from the side and a circle when viewed from above - which is the classic pattern shown in the exhibit. This bidirectional, symmetrical pattern with two equal lobes is the hallmark characteristic of a dipole antenna. Yagi antennas are incorrect because they produce a highly directional, single-lobe pattern focused in one direction, used for long-distance point-to-point links. Patch antennas are wrong because they radiate in a hemispherical pattern on one side only, commonly used in ceiling-mounted APs. Omnidirectional antennas are a close distractor, but their pattern appears as a flat, 360° horizontal ring with minimal vertical coverage - not the figure-8 side profile of a dipole.

Memory Tip: Think of a dipole as a "D"onut - the "D" in Dipole reminds you of the Donut-shaped 3D radiation pattern with that characteristic figure-8 side view. If you see a symmetrical two-lobe pattern in an exam exhibit, think dipole first!

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