Definition: | complex quantity γ_=α+jβ appearing in the complex representation of a wave A0exp(−γ_ x+jω t+jϑ0), where its real part A0exp(−α x)cos(−β x+ω t+ϑ0) represents, along a line parallel to the x-axis, a characteristic quantity of a guided sinusoidal wave or a plane sinusoidal wave, at angular frequency ω and initial phase ϑ0 Note 1 to entry: The concept of propagation coefficient has a meaning only when A0 and γ_ are substantially independent of x. Note 2 to entry: The propagation coefficient has the dimension of reciprocal length and is usually a function of frequency.
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