JEE PYQ: Communication System Question 24
Question 24 - 2019 (09 Apr 2019 Shift 2)
The physical sizes of the transmitter and receiver antenna in a communication system are:
(1) independent of both carrier and modulation frequency
(2) inversely proportional to carrier frequency
(3) inversely proportional to modulation frequency
(4) proportional to carrier frequency
Show Answer
Answer: (2)
Solution
Size of antenna: $l = \frac{\lambda}{4}$, $\lambda = \frac{c}{f}$, so $l \propto \frac{1}{f}$ — inversely proportional to carrier frequency.
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