TIA's Glossary of Telecommunication Terms
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propagation constant
For an electromagnetic field mode varying sinusoidally with time at a given frequency, the logarithmic rate of change, with respect to distance in a given direction, of the complex amplitude of any field component. Note: The propagation constant, 
, is a complex quantity given by = 
+i
, where , the real part, is the attenuation constant and , the imaginary part, is the phase constant.