Discussion
The stub length on single stub matching cancels :
Answer: A
The stub cancels the susceptance.
In single stub matching the stub is placed at the point on the line where the normalised admittance is 1 + jb, so that its conductance already matches the line. A short- or open-circuited stub of suitable length adds a susceptance of −jb, cancelling the unwanted susceptance and leaving a matched admittance of 1.
The conductance is matched by choosing the stub's position, not by the stub. Permeability is a property of the medium, and the stub works in admittance terms on the shunt susceptance, not on an inductance as such.
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