Question

The radiating power of a linear antenna of length $l$ for a wave of wavelength $\lambda$, is proportional to

• A. $\frac{l}{\lambda }$
• B. $\frac{l^2}{{\lambda }^2}$
• C. $\frac{l}{{\lambda }^2}$
• D. $\frac{l}{\sqrt{\lambda }}$
• E. $\frac{l^2}{\lambda }$

Answer 1

The correct option is B $\frac{l^2}{{\lambda }^2}$

The radiating power of linear antenna is given by

$P=\frac{\pi }{12}{I_o}^2{Z}_0(\frac{l}{\lambda }{)}^2$

where $I_0$ = Current

and Z= Impedance

so given option is correct.