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Question

Question: If both the length of an antenna and the wavelength of the signal to be transmitted are doubled, the...

If both the length of an antenna and the wavelength of the signal to be transmitted are doubled, the power radiated by the antenna

A

Is doubled

B

Is halved

C

Remains constant

D

Is quadrupled

Answer

Remains constant

Explanation

Solution

: Power radiated by the antenna is proportional to (1λ)2\left( \frac{1}{\lambda} \right)^{2}. When both the length of the antenna l and wavelength of the signal λ\lambdaare doubled, the power radiated by the antenna remains constant