_______________________________________________________________________ Antennas
Figure 4-42. Ground-Plane Antenna
Corner Reflector
4-175. When a unidirectional radiation pattern is desired, it can be obtained
by using a corner reflector with a half-wave dipole. A corner-reflector antenna
is a half-wave radiator with a reflector. The reflector consists of two flat
metal surfaces meeting at an angle immediately behind the radiator. In other
words, the radiator is set in the plane of a line bisecting the corner angle
formed by the reflector sheets. The construction of a corner reflector is shown
in figure 4-43, view B Corner-reflector antennas are mounted with the
radiator and the reflector in the horizontal position when horizontal
polarization is desired. In such cases the radiation pattern is very narrow in
the vertical plane, with maximum signal being radiated in line with the
bisector of the corner angle. The directivity in the horizontal plane is
approximately the same as for any half-wave radiator having a single-rod
type reflector behind it. If the antenna is mounted with the radiator and the
corner reflector in the vertical position, as shown in view A, maximum
4-55
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