TS EAMCET · Physics · Communication System
Which of the following statements is NOT true?
- A Power radiated from a linear antenna is directly proportional to square of antenna length
- B Power radiated decreases with increasing frequency.
- C Antenna should have size comparable to the wavelength of the signal
- D Effective power radiated by a long wavelength baseband signal is small
Answer & Solution
Correct Answer
(B) Power radiated decreases with increasing frequency.
Step-by-step Solution
Detailed explanation
We have \(\mathrm{P} \propto \frac{\mathrm{l}^2}{\lambda^2}\) So (a) is true \(\text {as, } \mathrm{P} \propto-\Rightarrow \mathrm{P} \propto \mathrm{f}\) So, (b) is false and (d) is true as, length of antenna \(\geq \frac{\lambda_{\mathrm{C}}}{4}\) So, (c) is true
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