Field and Wave Electromagnetics 2nd Edition by David Cheng

Exercise 60

Two elemental dipole antennas, each of length 2 h ( h ), are aligned colinearly along the z -axis with their centers spaced a distance d ( d 2 h ) apart. The excitations in the two antennas are of equal amplitude and equal phase.
a) Write the general expression for the far-zone electric field of this two-element colinear array.
b) Plot the normalized E -plane pattern for d = /2.
c) Repeat part (b) for d = .