Editing Input impedance (section)

===Impedance matching===
When the characteristic impedance of a [[transmission line]], <math>Z_{line}</math>, does not match the impedance of the load network, <math>Z_{in}</math>, the load network will reflect back some of the source signal. This can create [[standing waves]] on the transmission line. To minimize reflections, the characteristic impedance of the [[transmission line]] and the impedance of the load circuit have to be equal (or "matched"). If the impedance matches, the connection is known as a ''matched connection'', and the process of correcting an impedance mismatch is called ''[[impedance matching]]''. Since the characteristic impedance for a homogeneous transmission line is based on geometry alone and is therefore constant, and the load impedance can be measured independently, the matching condition holds regardless of the placement of the load (before or after the transmission line).
:<math>Z_{in} = Z_{line}</math>