________________________________________________________________________Glossary
nonluminous bodies
Objects that either reflect or diffuse light that falls
upon them.
nonresonant line
A transmission line that has no standing waves of
current or voltage.
normal
The imaginary line perpendicular to the point at which
the incident wave strikes the reflecting surface. Also
called the perpendicular.
null
On a polar-coordinate graph, the area that represents
minimum or 0 radiation.
omnidirectional
Transmitting in all directions.
opaque
A type of substance that does not transmit any light
rays.
open-ended line
A transmission line that has an infinitely large
terminating impedance.
optimum working
The most practical operating frequency that can be used
frequency (fot)
with the least amount of problems; roughly 85 percent
of the maximum usable frequency.
origin
The point on a graph where the vertical and horizontal
axes cross each other.
output end
The end of a transmission line that is opposite the
source.
output impedance
The impedance presented to the load by the
transmission line and its source.
parallel resonant
circuit
parallel-wire
A type of transmission line consisting of two parallel
wires.
parasitic array
An array that has one or more parasitic elements.
parasitic element
The passive element of an antenna array that is
connected to neither the transmission line nor the
driven element.
period
The amount of time required for completion of one full
cycle.
pitch
A term used to describe the frequency of a sound heard
by the human ear.
Glossary-9
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