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
Correct Option: , 2
(2) Size of antenna,'
$l=\frac{\lambda}{4} .$ As $\lambda=\frac{C}{f} \therefore l \propto \frac{1}{f}$
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