Question

The physical sizes of the transmitter and receiver antenna in a communication system are-

• A. Proportional to carrier frequency
• B. Inversely proportional to carrier frequency
• C. Independent of both carrier and modulation frequency
• D. Inversely proportional to modulation frequency

Answer 1

The correct option is B Inversely proportional to carrier frequency

Size of antenna, $l=\frac{\lambda }{4}$
$\because \lambda =\frac{c}{f}\Rightarrow l\propto \frac{1}{f}$
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\left(B\right)$ is the correct answer.