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The circuit on the left shows a feedline connected to a load with admittance, Y sub L. The input admittance is Y sub in while feedline admittance is Y sub 0. A shorted-stub with admittance Y sub s is connected in parallel over a network of length l, between terminals M, M-prime at a distance d from the load. The admittance of the transmission line to the right of the stub network is Y sub d.

Drawing on the right shows an equivalent circuit where a feedline with input admittance Y sub in connects to a parallel connection of two admittances, Y sub d and Y sub s, across terminals M, M-prime.