Beamwidth MCQs

Practice Beamwidth MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Antenna & Wave PropagationBeamwidth

The half-power beamwidth of an antenna is the angular separation between points where the radiated power falls to?

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Correct Answer: A. Half of its maximum value

Explanation: At the half-power points, power is 0.5 of maximum, corresponding to about -3 dB.

Reference: Standard antenna and wave propagation: beamwidth

Question 2

Antenna & Wave PropagationBeamwidth

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Correct Answer: B. 0.707

Explanation: Power is proportional to field magnitude squared, so half power corresponds to field magnitude 1/sqrt(2)≈0.707 of maximum.

Reference: Standard antenna and wave propagation: beamwidth

Question 3

Antenna & Wave PropagationBeamwidth

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Correct Answer: A. Higher directivity

Explanation: Concentrating radiation into a narrower angular region generally increases antenna directivity.

Reference: Standard antenna and wave propagation: beamwidth

Question 4

Antenna & Wave PropagationBeamwidth

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Correct Answer: A. Narrower

Explanation: Higher frequency means smaller wavelength, increasing electrical aperture size and generally narrowing the beam.

Reference: Standard antenna and wave propagation: beamwidth