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The beam-width becomes narrower on

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The beam-width becomes narrower on

(a) Increasing frequency

(b) Increasing antenna size

(c) Increasing frequency & antenna size

(d) None of the mentioned

I have been asked this question during an online interview.

My question is from Link Budget Analysis and Error Control topic in chapter Communication Link Analysis of Digital Communications

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Best answer
Right choice is (c) Increasing frequency & antenna size

For explanation: Increasing either the signal frequency or antenna size results in narrower beam-width.

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