Q.

If the beam width of an antenna in two orthogonal planes are 300 and 600. Then the directivity of the antenna is:

A. 24
B. 18
C. 36
D. 12
Answer» B. 18
Explanation: given the beam width of the antenna in 2 planes, the directivity is given by 32400/θ*∅, where θ,∅ are the beam widths in the two orthogonal planes. substituting in the equation, directivity of the antenna is 18.
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