# standing-wave ratio

## Definitions

### Electronics

- For a given transmission line, such as a coaxial cable or
__waveguide__, the __ratio__ of the maximum voltage to the minimum __voltage__. It is a measure of the impedance matching of the line. This ratio is __equal__ to 1 when there is complete impedance matching, in which case the __maximum__ possible __RF power__ reaches the load, such as an antenna. Also called voltage standing wave ratio. - For a given
__transmission__ line, such as a coaxial __cable__ or __waveguide__, the __ratio__ of the __maximum current__ to the minimum __current__. It is a measure of the impedance matching of the line. This ratio is equal to 1 when there is complete impedance matching, in which case the maximum possible __RF power__ reaches the load, such as an antenna. Also called current standing-__wave__ ratio. - acronymSWR

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