_______________________________________________________________________ Antennas
Figure 4-27. Typical Broadside Array
4-125. Radiation pattern. Figure 4-28 shows an end view of two parallel
half-wave antennas (A and B) operating in the same phase and located one-
half wavelength apart. At a point (P) far removed from the antennas, the
antennas appear as a single point. Energy radiating toward P from antenna
A starts out in phase with the energy radiating from antenna B in the same
direction. Propagation from each antenna travels over the same distance to
point P, arriving there in phase. The antennas reinforce each other in this
direction, making a strong signal available at P. Field strength measured at
P is greater than it would be if the total power supplied to both antennas had
been fed to a single dipole. Radiation toward point P1 is built up in the same
manner.
4-37
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