Flashlight as anistropic source of radiation.
(a) The terms dipole and doublet are used
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
See figure 34.
There is a vertical as well as a
form of a doughnut.
Whether it is seen from the side or from the
top, the pattern is full.