What Does Standing Wave Ratio (SWR) Mean?
Standing wave ratio (SWR) is the measurement of a type of impedance mismatch that can cause poor transmission efficiency in radio engineering. Impedance mismatch may cause standing waves along the transmission line.
Techopedia Explains Standing Wave Ratio (SWR)
A standing wave, in the context of its physical definition, oscillates in time, but includes a peak amplitude profile that does not move in space. Standing waves were first observed by Michael Faraday in the 19th century.