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Question 20219
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Principles of Communication: Antenna MCQ

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AntennaMediumQuestion 20219

Question

For efficient radiation, the length of a transmitting antenna should be approximately:
  1. A
    Equal to the wavelength
  2. B
    One-fourth of the wavelength
  3. C
    Half the wavelength
    Correct
  4. D
    Twice the wavelength

Correct answer

Half the wavelength

Explanation

A half-wave dipole antenna (length = λ/2) is the standard resonant antenna. At 1 MHz (λ = 300 m), the antenna is 150 m. At 100 MHz (FM), it is 1.5 m — practical.

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