HB3YAQLucerne
SWR / standing wave ratio
SWR is the ratio of maximum to minimum voltage on a line with standing waves. It is related to reflection caused by an impedance mismatch.
Also found under: SWR · VSWR · Stehwellenverhältnis · Standing Wave Ratio
A concrete example
At SWR 2:1 the reflection-coefficient magnitude is 1/3; the reflected power fraction at that point is about 11.1%.
What to keep in mind
Low SWR does not prove antenna efficiency: a matched dummy load can also have 1:1 SWR.
Further reference
Original explanation based on the technical documentation. Reviewed on 15 October 2026.
Mini-Circuits · The effect of VSWR on transmitted power ↗