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Feed-Line Impedance

August 11th Fact-of-the-Day

Conditions for maximum power transfer through a transmission line require source and load impedances to be conjugates, respectively, of the line input impedances seen from each end with opposite-end terminations connected. However, conditions for no-reflections at the ends of a line require that source and load impedances equal line impedance. Those two requirements are mutually incompatible unless a line's impedance is pure resistance (i.e., unless a line's impedance has no inductive or capacitive reactance component). ©2004 Martek International All rights reserved.


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