A

Admin • 833K Points
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Q. A parabolic reflector used for reception with the direct broadcast system is 18 inches in diameter and operates at 12.4 GHz. The far-field distance for this antenna is:

  • (A) 18 m
  • (B) 13 m
  • (C) 16.4 m
  • (D) 17.3 m

Explanation by: Admin

far field distance for a reflector antenna is given by 2d2/λ. d is the diameter and λ is the operating signal wavelength.

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