Correct Answer - Option 1 : Its length is an integral multiple of
\(\frac{{n\lambda }}{2}\)
Analysis:
Mathematically, it has been obtained that when βl = nπ, the antenna behaves as a short circuit.
βl = phase length
Since one complete time period or wavelength of a sinusoidal sin wave covers 2π radians, i.e.
λ = 2π radians
\(\pi =\frac{\lambda}{2}\)
The expression for resonance can be written as:
\(β l=\frac{{n\lambda }}{2}\)
∴ An antenna behaves as a Resonant Circuit if Its length is an integral multiple of \(\frac{{n\lambda }}{2}\).