Refer to the exhibit. Which type of antenna do the radiation patterns present?

Question

Exhibits

Options

• APatch
• BOmnidirectional
• CYagi
• DDipole

• A
  89% (24)
• B
  7% (2)
• D
  4% (1)

Explanation

Patch Antenna Radiation Pattern

A patch antenna produces a highly directional, hemispherical radiation pattern that radiates energy primarily in one direction (forward-facing lobe), which is exactly what the exhibit depicts - a single, focused beam projecting away from a flat surface with minimal back radiation. Patch antennas are flat, low-profile antennas commonly used in access points and are mounted flush against a surface, which naturally creates this one-sided, directional pattern.

Why the distractors are wrong:

• Omnidirectional (B) antennas radiate equally in all directions on a horizontal plane, producing a classic "donut-shaped" pattern - the opposite of what's shown
• Yagi (C) antennas produce a very narrow, elongated forward beam with a distinct main lobe and visible side/back lobes, which differs from the cleaner hemispherical patch pattern
• Dipole (D) antennas produce a toroidal (donut-shaped) pattern similar to omnidirectional, radiating in all horizontal directions simultaneously

Memory Tip: Think "Patch = one-sided like a patch on a wall." Just like a wall patch covers only one side, a patch antenna radiates in only one direction - making its radiation pattern look like a half-sphere or single bubble facing outward.

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