TC 9-64 _________________________________________________________________________
ground-plane
A type of antenna that uses a ground plane as a
antenna
simulated ground to produce low-angle radiation.
ground reflection
The loss of RF energy each time a radio wave is
loss
reflected from the earth's surface.
ground screen
A series of conductors buried below the surface of the
earth and arranged in a radial pattern. Used to reduce
losses in the ground.
ground waves
Radio waves that travel near the surface of the earth.
half-wave dipole
An antenna, consisting of two rods (one-quarter
antenna
wavelength each) in a straight line, that radiates
electromagnetic energy.
A frequency that is a whole number multiple of a
smaller base frequency.
Hertz antenna
A half-wave antenna installed some distance above
ground and positioned either vertically or horizontally.
high frequency (HF)
The range of the radio frequency spectrum extending
from 3 MHz to 30 MHz.
horizontal axis
On a graph, the straight line axis plotted from left to
right.
horizontal pattern
The part of a radiation pattern that is radiated in all
directions along the horizontal plane.
horizontally
Waves that are radiated with their E field component
polarized
parallel to the earth's surface.
incident wave
(1) The wave that strikes the surface of a medium. (2)
The wave that travels from the sending end to the
receiving end of a transmission line.
induction field
The electromagnetic field produced about an antenna
when current and voltage are present on the same
induction losses
The losses that occur when the electromagnetic field
around a conductor cuts through a nearby metallic
object and induces a current into that object.
infrasonic
Sounds below 15 hertz.
(subsonic)
input end
The end of a two-wire transmission line that is
connected to a source.
Glossary-6
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