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Isha lohan 1
Propagation constant is a measure of changes in a sinusoidal electromagnetic wave in terms of amplitude and phase, while propagating through a medium. This can be a transmission line or free space. The Propagation constant is a dimensionless quantity. YES It is equal to the, alpha + i * beta. Here, α = Attenuation constant, it causes the signal amplitude to decrease while propagating through a transmission line. It is always a positive number, if we get a negative attenuation constant that means we are violating the first law of thermodynamics. β = Phase constant, it is the imaginary component of the propagation constant. It gives us the phase of the signal along a transmission line, at a constant time. Ask if any further doubt. For details of this topic, you may refer to Griffith's book of Electrodynamics . There it is explained very deeply.