Question
What is the approximate length of the driven element of a Yagi antenna?
Answer Options
- A) 1/4 wavelength
- B) 1/2 wavelength
- C) 3/4 wavelength
- D) 1 wavelength
Correct Answer: B
Explanation
A Yagi antenna is a highly directional antenna composed of a driven element, a reflector, and one or more directors. The driven element is the only part of the antenna that is directly connected to the feed line and is the active radiator of the signal.
To be resonant and efficiently accept power, the driven element of a Yagi antenna is constructed to be approximately \frac{1}{2} wavelength long. This allows it to be fed at the center, typically near 50 \text{ to } 75 \text{ ohms} impedance, and function as the primary radiating component of the array.
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