Propagation constant

nounStandard termTelecom & IT

A complex mathematical value that describes how an electromagnetic wave changes as it travels through a medium.

A parameter used in transmission line theory to quantify the attenuation and phase shift of a signal per unit length. The real part (attenuation constant) measures the loss of signal amplitude, while the imaginary part (phase constant) measures the shift in phase. Engineers use this metric to model signal degradation over long cable runs or optical fibers.

Heard on the job

If you look at the propagation constant for this coax at 2.4 GHz, the attenuation is too high for a 100-foot run.