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Antenna & Wave PropagationParabolic Reflector

For a parabolic reflector of fixed efficiency and wavelength, increasing the dish diameter generally?

  • AIncreases gain and narrows the beam
  • BDecreases gain and narrows the beam
  • CLeaves gain unchanged
  • DMakes the antenna isotropic
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Correct Answer: A. Increases gain and narrows the beam
Explanation: Reflector gain is approximately proportional to (D/lambda)², so a larger diameter gives higher gain and a narrower beam.
Reference: Standard antenna and wave propagation: parabolic reflector
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