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

Question:

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

1. (1) independent of both carrier and modulation frequency

2. (2) inversely proportional to carrier frequency

3. (3) inversely proportional to modulation frequency

4. (4) proportional to carrier frequency

Correct Option: , 2

Solution:

(2) Size of antenna,'

$l=\frac{\lambda}{4} .$ As $\lambda=\frac{C}{f} \therefore l \propto \frac{1}{f}$