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Antenna Arrays MCQs

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

Question 1
Antenna & Wave PropagationAntenna Arrays

An antenna array is formed by using?

  • AMultiple radiating elements arranged and excited to obtain a desired radiation pattern
  • BA single resistor only
  • COnly one isotropic point with no feed
  • DA capacitor bank with no radiators
Report an error
Correct Answer: A. Multiple radiating elements arranged and excited to obtain a desired radiation pattern
Explanation: Arrays combine fields from multiple antenna elements to shape beam direction, gain and sidelobe behavior.
Reference: Standard antenna and wave propagation: antenna arrays
Question 2
Antenna & Wave PropagationAntenna Arrays

In a broadside linear array, the principal maximum is ideally directed?

  • AAlong the array axis
  • BPerpendicular to the array axis
  • COnly toward the feed point
  • DRandomly
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Correct Answer: B. Perpendicular to the array axis
Explanation: A broadside array is phased so that its main beam is normal to the array axis.
Reference: Standard antenna and wave propagation: antenna arrays
Question 3
Antenna & Wave PropagationAntenna Arrays

In an end-fire array, the principal radiation is directed approximately?

  • AAlong the array axis
  • BPerpendicular to the array axis
  • COnly vertically regardless of orientation
  • DEqually in all directions
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Correct Answer: A. Along the array axis
Explanation: An end-fire array is phased to produce its main beam along the array axis.
Reference: Standard antenna and wave propagation: antenna arrays
Question 4
Antenna & Wave PropagationAntenna Arrays

The array factor of an antenna array primarily depends on element?

  • APositions and relative excitation amplitudes/phases
  • BConductor color
  • CMechanical weight only
  • DDielectric breakdown voltage only
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Correct Answer: A. Positions and relative excitation amplitudes/phases
Explanation: Array factor is determined by the geometry and relative complex excitation of the elements, separate from the individual element pattern.
Reference: Standard antenna and wave propagation: antenna arrays
Question 5
Antenna & Wave PropagationAntenna Arrays

In a uniform linear array, increasing the number of similarly spaced elements while maintaining a comparable aperture arrangement generally tends to?

  • AIncrease directivity and narrow the main beam
  • BReduce directivity to zero
  • CMake all sidelobes disappear automatically
  • DMake element spacing irrelevant
Report an error
Correct Answer: A. Increase directivity and narrow the main beam
Explanation: More coherently combined elements generally provide a larger effective aperture, higher directivity and narrower main beam.
Reference: Standard antenna and wave propagation: antenna arrays