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Information Systems Technician Training Series, Module 4 - Communications Hardware | Next
Emergency Antennas |
Figure 2-31.—Sleeve antenna (shore stations).
Therefore, this antenna is well suited for long-distance
communications in the HF band.
INVERTED CONE ANTENNA
The inverted cone antenna (figure 2-33) is
vertically polarized, omnidirectional, and very
broadbanded. It is used for HF communications in ship-
to-shore, broadcast, and ground-to-air applications.
The radial ground plane that forms the ground system
for inverted cones is typical of the requirement for
vertically polarized, ground-mounted antennas. The
radial wires are one-quarter-wavelength long at the
lowest designed frequency.
Figure 2-32.—Conical monopole antenna.
LOG-PERIODIC ANTENNA
The log-periodic (LP) antenna operates over an
extremely wide frequency range in the HF and VHF
Figure 2-33.—Inverted cone antenna.
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