attenuation constant

In telecommunication, the term attenuation constant has the following meanings: 1. The real part of the propagation constant in any electromagnetic propagation medium. The attenuation constant is usually expressed as a numerical value per unit length and may be calculated or experimentally determined for each medium. The attenuation constant, which is in the "natural" units of nepers/meter can be broken down into two components, one representing metal loss, the other representing dielectric loss: The loss of most transmission lines are dominated by the metal loss, which varies by approximately
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1. The real part of the propagation constant in any electromagnetic propagation medium. Note 1: The attenuation constant is usually expressed as a numerical value per unit length. Note 2: The attenuation constant may be calculated or experimentally determined for each medium. 2. For a particular propagation mode in an optical fiber, the real part of the axial propagation constant.

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