Mismatch loss in transmission line theory is the amount of power expressed in decibels that will not be available on the output due to impedance mismatches and signal reflections. A transmission line that is properly terminated, that is, terminated with the same impedance as that of the characteristic impedance of the transmission line, will have no reflections and therefore no mismatch loss. Mismatch loss represents the amount of power wasted in the system[dubious – discuss]. It can also be thought of as the amount of power gained if the system was perfectly matched[dubious – discuss]. Impedance matching is an important part of RF system design; however, in practice there will likely be some degree of mismatch loss.[1] In real systems, relatively little loss is due to mismatch loss and is often on the order of 1dB[dubious – discuss].
According to Walter Maxwell[2] mismatch does not result in any loss ("wasted" signal), except through the transmission line. This is because the signal reflected from the load is transmitted back to the source, where it is re-reflected due to the reactive impedance presented by the source, back to the load, until all of the signal's power is emitted or absorbed by the load.
^Daniels, David J. (2004). Ground penetrating radar (2nd Edition). Institution of Engineering and Technology. ISBN 978-0-86341-360-5
^Maxwell, M Walter (2010). Reflections III. ISBN 0-943016-43-6
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