Figure 33. Flashlight as anistropic source of radiation.
(2) Dipole antenna radiation.
(a) The terms dipole and doublet are used
interchangeably.
Both are used to indicate a basic half-wave antenna.
(b) Radiation pattern of a doublet.
The doublet is the
simplest form of an antenna. The radiation pattern is similar to the
flashlight.
See figure 34.
There is a vertical as well as a
horizontal radiation pattern. As you can see, the pattern is in the
form of a doughnut.
Whether it is seen from the side or from the
top, the pattern is full.
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