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Antenna & Wave PropagationEffective Aperture

An isotropic receiving antenna operating at wavelength 2 m has an effective aperture of approximately?

  • A0.0796 m²
  • B0.159 m²
  • C0.318 m²
  • D1.273 m²
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Correct Answer: C. 0.318 m²
Explanation: For G=1, Ae=λ²/(4π)=4/(4π)=1/π≈0.318 m².
Reference: Standard antenna and wave propagation: effective aperture
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