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:

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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

(D) 17.3 m

Correct : Option (D)

Explanation:

 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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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:

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