(1) Absorbing light waves. Does not allow any reflection
or refraction. (2) Atmospheric absorption of RF energy
The science of sound.
An electrical current, which constantly changes
amplitude and polarity at regular intervals.
The portion of a cycle measured from a reference line to
a maximum value above (or to a maximum value below)
angle of incidence
The angle between the incident wave and the normal.
angle of reflection
The angle between the reflected wave and the normal.
angle of refraction
The angle between the normal and the path of a wave
through the second medium.
The unit used to define the wavelength of light waves.
The property of a radiator to emit strong radiation in
A conductor or set of conductors used either to radiate
RF energy into space or to collect RF energy from space.
array of arrays
Same as COMBINATION ARRAY.
A horizontal, longwire antenna designed for reception
and transmission of low-frequency, vertically polarized
An array that radiates in opposite directions along the
line of maximum radiation.
An array in which the direction of maximum radiation
is perpendicular to the plane containing the elements.