Determination of Available Power from Resistive Multiports

The concept of available power
(P_{A})
is extended to multiports. A theorem is proved, which gives a necessary condition for
P_{A}
to be achieved with all positive load resistances for the case of resistive-reciprocal multiports. Based on the theorem, a procedure is outlined for determining
P_{A}
for resistive multiports. The method requires the solution of simultaneous linear equations only. Two examples are given.