COAXIAL LINEA type of transmission line that
contains two concentric conductors.
COLLINEAR ARRAYAn array with all the
elements in a straight line. Maximum radiation
is perpendicular to the axis of the elements.
COMBINATION ARRAYAn array system that
uses the characteristics of more than one array.
Also known as ARRAY OF ARRAYS.
COMPLEX WAAEA wave produced by combining
two or more pure tones at the same time.
CONDUCTANCEThe opposite of resistance in
The minute amount of
resistance that is present in the insulator of a
CONNECTED ARRAYsee DRIVEN ARRAY
COPPER LOSSPower loss in copper conductors
caused by the internal resistance of the conductors
to current flow. Also know as 12R LOSS.
CORNER-REFLECTOR ANTENNAA half-wave
antenna with a reflector consisting of two flat
metal surfaces meeting at an angle behind the
COUNTERPOISEA network of wire that is
connected to a quarter-wave antenna at one end
and provides the equivalent of an additional ¼
COUPLING DEVICEA coupling coil that con-
nects the transmitter to the feeder.
CREST (TOP)The peak of the positive alternation
(maximum value above the line) of a wave.
CRITICAL ANGLEThe maximum angle at which
radio waves can be transmitted and still be
refracted back to earth.
CRITICAL FREQUENCYThe maximum fre-
quency at which a radio wave can be transmitted
vertically and still be refracted back to earth.
CURRENT-FEED METHODSee CENTER-FEED
C U R R E N T S T A N D I N G - W A V E R A T I O
(ISWR)The ratio of maximum to minimum
current along a transmission line.
CUTOFF FREQUENCYThe frequency at which
the attenuation of a waveguide increases sharply
and below which a traveling wave in a given
mode cannot be maintained. A frequency with
a half wavelength that is greater than the wide
dimension of a waveguide.
CYCLEOne complete alternation of a sine wave
that has a maximum value above and a maximum
value below the reference line.
DAMPINGReduction of energy by absorption.
DENSITY(1) The compactness of a substance;
(2) Mass per unit volume.
DETECTORThe device that responds to a wave
DIELECTRIC HEATINGThe heating of an
insulating material by placing it in a high
frequency electric field.
DIELECTRIC LOSSESThe losses resulting from
the heating effect on the dielectric material
DIELECTRIC CONSTANTThe ratio of a given
dielectric to the dielectric value of a vacuum.
DIFFRACTIONThe bending of the paths of waves
when the waves meet some form of obstruction.
DIPOLEA 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