Question

For a Hertz dipole antenna, the Half power Beam Width (HPBW) in the E-plane is

Answer 1

Ans : (c)


E-plane means $\theta$-plane or vertical plane

$E\alpha sin\theta$ in Hertzian dipole

$E_{max}$ when $\theta ={90}^{\circ }$


$E_{min}$ when $\theta =0^{\circ }$

E has half power of maximum when $\theta ={45}^{\circ }$ and ${135}^{\circ }$

HPBW in $\theta$ side = ${135}^{\circ }-{45}^{\circ }={90}^{\circ }$