Difference between revisions of "Attenuation Constant"
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Latest revision as of 17:00, 30 March 2007
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Attenuation Constant
1. A measure of the rate of attenuation per unit length; the
rate of flux-density (or power) reduction as energy (visual, electromagnetic,
acoustic) propagates from its source. Also called attenuation
factor, decay constant . Compare
attenuation coefficient.
For free-space transmission of radar frequency energy,
the attenuation constant is usually expressed in decibels per
mile or kilometer (db/mi or db/km).
2. Specifically, of a traveling plane wave at a given frequency,
the relative rate of decrease of amplitude of a field component
(or of voltage or current) in direction of propagation in nepers
per unit length.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
