________________________________________________________________________Glossary
feeder
A transmission line that carries energy to the antenna.
flat line
A transmission line that has no standing waves. This
line requires no special tuning device to transfer
maximum power.
flexible coaxial line
A coaxial line made with a flexible inner conductor
insulated from the outer conductor by a solid,
continuous insulating material.
FM
field manual
folded dipole
An ordinary half-wave antenna (dipole) that has one or
more additional conductors connected across the ends
parallel to each other.
four-element array
An array with three parasitic elements and one driven
element.
free-space loss
The loss of energy of a radio wave because of the
spreading of the wavefront as it travels from the
frequency
The number of cycles that occur in one second. Usually
expressed in hertz.
frequency diversity
Transmitting (and receiving) of radio waves on two
different frequencies simultaneously.
frequency
Frequency modulation is a method of impressing data
modulation (FM)
onto an alternating-current wave by varying the
instantaneous frequency of the wave. This scheme can
be used with analog or digital data.
front-to-back ratio
The ratio of the energy radiated in the principal
direction to the energy radiated in the opposite
direction.
fundamental
frequency
gain
The ratio between the amount of energy propagated
from an antenna that is directional to the energy from
the same antenna that would be propagated if the
antenna were not directional.
generator end
See INPUT END.
ground plane
The portion of a ground plane antenna that acts as
ground.
Glossary-5
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