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The net complex power involved in the propagation can be
defined as [40]
where all quantities above are functions of as in (21).
The quantity
is called rightgoing active power (or rightgoing average dissipated power^{}),
while
is called the leftgoing active
power. The term , the rightgoing minus the leftgoing power
components, we call the net active power, while the term
is net reactive power.
These names all stem from the case in which the matrix
is positive definite for . In this case, both the
components of the active power are real and positive, the active power itself is real,
while the reactive power is purely imaginary.
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