________________________________________________________________________Glossary
critical angle
The maximum angle at which radio waves can be
transmitted and still be refracted back to earth.
critical frequency
The maximum frequency at which a radio wave can be
transmitted vertically and still be refracted back to
earth.
current-feed method
Same as CENTER-FEED METHOD.
current standing-
The ratio of maximum to minimum current along a
wave ratio (ISWR)
transmission line.
cycle
One complete alternation of a sine wave that has a
maximum value above and a maximum value below the
reference line.
damping
Reduction of energy by absorption.
density
(1) The compactness of a substance. (2) Mass per unit
volume.
detector
The device that responds to a wave or disturbance.
dielectric heating
The heating of an insulating material by placing it in a
high frequency electric field.
dielectric losses
The losses resulting from the heating effect on the
dielectric material between conductors.
The bending of the paths of waves when the waves meet
some form of obstruction.
diffusion
The scattering of reflected light waves (beams) from an
object, such as white paper.
dipole
A common type of half-wave antenna made from a
straight piece of wire cut in half. Each half operates at a
quarter wavelength of the output.
direct current (DC)
An electric current that flows in one direction.
directional
Radiation that varies with direction.
director
The parasitic element of an array that reinforces energy
coming from the driver toward itself.
The property of an array that causes more radiation to
take place in certain directions than in others.
The refraction of light waves that causes the different
frequencies to bend at slightly different angles.
Glossary-3
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