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The net complex power involved in the propagation can be
defined as [4]
where all quantities above may be functions of , and
``'' denotes paraconjugation (transposition and
complex conjugation on the unit circle in the plane). The quantity
is called rightgoing active power (or rightgoing
average dissipated power^{4}), 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 traveling components of the
active power are real and positive, the active power itself is real, and
the reactive power is purely imaginary.
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