GATE EC 2015 Set 3 — Question 34
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Electromagnetics → Antennas → Effective Aperture
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Question
The directivity of an antenna array can be increased by adding more antenna elements, as a larger number of elements
Correct answer
(B) increases the effective area of the antenna
Solution
The directivity of an antenna is directly proportional to its maximum effective aperture area according to the relation . By adding more elements to an antenna array, the physical size and consequently the effective area of the antenna increase, which leads to an increase in directivity. Additionally, more elements narrow the radiation beam, reducing the beam solid angle and increasing directivity.
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