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:

Mr. Dubey • 89.33K Points
Coach

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 Answer - Option(D)
Views: 560
Filed under category Antennas and Microwave Engineering

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

You must be Logged in to update hint/solution

Discusssion

Be the first to start discuss.

Q. For derries and winches which of the following drives can be used ?

Q. Which of the following motors has series characteristics?

Q. For given maximum axle load tractive efforts of AC. locomotive will be

Q. Open circuited armature coil of a D.C. machine is

Q. __________ can be extended to systems which are time-varying?

Q. A closed switch has a resistance of

Q. Which of the following motors always starts on load ?

Q. Which of the following happens when star-delta starter is used ?

Q. The least expensive drive is

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:

Explanation by: Mr. Dubey

Discusssion

Related MCQs

Question analytics