Refer to the exhibit. Which type of antenna does the radiation pattern represent?

Question

Exhibit

Options

• AYagi
• Bmultidirectional
• Cdirectional patch
• Domnidirectional

• A
  95% (21)
• D
  5% (1)

Explanation

Yagi Antenna Radiation Pattern

A Yagi antenna produces a highly focused, narrow beam that projects strongly in one primary direction with smaller side lobes and a minimal back lobe - this distinctive elongated, asymmetrical pattern is what the exhibit displays. This makes it ideal for point-to-point communication over long distances, as its gain is concentrated in a single forward direction.

Why the distractors are wrong:

• B (Multidirectional): A multidirectional pattern would show energy radiating in multiple distinct directions, not a single dominant beam.
• C (Directional patch): A patch antenna is also directional but produces a wider, hemispherical beam pattern - broader and less focused than the Yagi's sharp lobe.
• D (Omnidirectional): An omnidirectional antenna (like a dipole) radiates a donut-shaped pattern equally in all horizontal directions, which looks circular from above - the opposite of the Yagi's narrow beam.

Memory Tip: Think of a Yagi as a "flashlight" - it throws a tight, focused beam in one direction with a recognizable elongated pattern. If the radiation pattern looks like a pointed bullet or teardrop aimed in one direction, think Yagi.

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